How To: Dropping the front differental after TB crank (MMP) - Page 16 - Chevy Colorado & GMC Canyon
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post #301 of 318 (permalink) Old 06-06-2013, 10:30 PM
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Yeah i can hear the nut spinning and the weld that held it on catch every turn. It is an 05 and i live in western pa so i have a little bit of rust going on. After taking the wheel off i will be able to get to the frame but i was able to get a new nut through a factory made hole in the frame to tighten that part of the differential. Im just holding off until i find some time to do this. Until then, i have a good two inch rake going on.
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post #302 of 318 (permalink) Old 09-06-2013, 02:16 PM
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My First Post

Supermod-
Does Suspension Maxx still make those 3/4" spacers? Looking on their website I don't see any kits but maybe they have it somewhere else(not under Chevy Colorado). If not do you know of a place I can get them, also I'm looking for the bolts to go along with it as well. They only things I have found are these...
Socket Head Cap Screws M14 x 2.0 (20mm-120mm)
They do come at 120mm however I'm unsure as to what grade they are, if you have some insight or direction on the matter that would be great! And just to verify you did 1/2" spacers with 1 1/2" TB lift? Have you played around with that at all like going higher, larger spacers, etc?
I recently got my first truck and it is a 2008 Chevy Colorado, I want to get 33" tires, 34" would be even better but for now I'll be putting 32" until I figure out what else I want to do. I just received my Rough Country 2.25" leveling kit in the mail
Chevy/GMC Colorado Suspension Lift Kit
(Shackles and what looks to be a TB spacer?? I find the TB spacer odd, but I'm very new to all this). Just waiting on my new Rancho Shocks to come in and I'll be putting it all together.
But after I do the lift I want to lower my differential to help the wear on the CV boots and axles, however I also want more of a lift. Any advice or recommendations is greatly appreciated!
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post #303 of 318 (permalink) Old 09-06-2013, 05:46 PM
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You have to contact SuspensionMaxx for the differential spacers. Both spacers and bolts are available by phone. Bolts are only necessary for larger spacers. Stock bolts are fine for 3/4" spacers. Call them, Larry is who you want to speak with. However, the entire shop is knowledgeable.

You can fit 33x10.5" tires under your truck, if you're lucky. You need a Z71 and about max torsion bar lift to clear it though. Stop thinking of anything taller. 32's (the metric equivalent) is better. Like 265/75-16. 32x11.5 will probably rub someplace.....depending on the wheels you buy. Stock wheels, forget it.

More of a lift comes from a subframe lift or a body lift.
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post #304 of 318 (permalink) Old 09-09-2013, 11:14 AM
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Oh really? Why wouldn't putting standard 32s work on the stock rims? And thanks for the info I think I do want to put a body lift onto my truck now.

Edit: stock rims/wheels

Also I should say that I have 15" wheels, I'm guessing that's pretty common though. I was hoping to get these tires once I put the new shackles and TB lift.

Last edited by snaveevans; 09-09-2013 at 11:28 AM.
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post #305 of 318 (permalink) Old 09-09-2013, 12:28 PM
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Originally Posted by snaveevans View Post
Oh really? Why wouldn't putting standard 32s work on the stock rims? And thanks for the info I think I do want to put a body lift onto my truck now.

Edit: stock rims/wheels

Also I should say that I have 15" wheels, I'm guessing that's pretty common though. I was hoping to get these tires once I put the new shackles and TB lift.
You are the lucky recipient of 2 answers.

This is mostly my opinion but 32x11.50 is WAY too wide for a 7" wheel (if you drive a Z71).
A Z85 truck has 6.5" wheels.

Look at the manufacturer site to learn nobody that sells a 32x11.50-15 will suggest installing it on a 6.5" or 7" wide tire. I don't think a shop will warranty tire wear on a tire mounted on on unapproved wheel width.

Will it mount. Yes...will you see premature tire wear? Most likely. The sidewalls are pulled in more and makes the edges of the tire not make contact with the surface, but the center has excess pressure at the contact point. If you under inflate the tire to try getting full surface contact you will end up cupping the center of the tire contact area.

If you have a Z85, 32x11.5 may not fit anyway. If you have a 2wd base model they definitely won't fit. All Z71's have the same height.

Sorry for all the info but you haven't given me anything to go on. You made a blanket comment on a truck with several suspension options.
1) 2wd base
2) 2wd Z71
3) 4x4 Z85
4) 4x4 Z71 (same as 2wd Z71)
5) Sport

You said you have torsion bars (assuming you know for sure) that rules out options 1 & 5.

GM changed wheels to 16" also, 2009 I believe. So 15" isn't necessarily common anyway.

Good luck.
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post #306 of 318 (permalink) Old 09-09-2013, 02:17 PM
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Hmmm, I'm unsure as to if mine is the Z85 or the Z71. It is one of the two tho and it is 4x4. I know it has TBs, it came with quite a bit of rake. And dang for some reason I was thinking those wheels were 10.5" wide, which is just a tad bigger than the ones I have now. I have 265/70r15. Does anyone even make 32" 10.5 r15 or a metric equivalent.

Edit:
Found some 33" x 10.5 r15, if I did a 1.5" body lift would I be able to eek those on there?

Last edited by snaveevans; 09-09-2013 at 02:33 PM.
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post #307 of 318 (permalink) Old 09-09-2013, 06:23 PM
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33x10.5 is a common tire size. I can't say if it will fit though, sorry. I don't remember the requirements to clear 33's.

Open your glove box and locate the big silver sticker affixed to the backside of the door. There are alpha-numeric codes. One of them will say either Z85 or Z71.

They all come with rake.

Definitely not a 10.5" wheel.

265/75-17 or 70-17 are about a 31.7" tall tire by 10.4" wide. That's the most common size tire as a larger size.

Stock 15" Z71 wheels are 265/75-15. Stock 15" Z85 wheels are 235/75-15. Your size is different than either of those, so anything is possible. Somebody either oversized a Z85 tire or undersized a Z71 tire prior to your purchase. Also, stock tire sizes are on the manufacturer sticker located on the driver side door jamb.

I trust you have the 3.5l 5-cylinder engine?
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post #308 of 318 (permalink) Old 09-09-2013, 07:22 PM
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Yeah, I have the I5 engine. I never thought about them putting on oversized or undersized tires on there, I'll have to check that out when I get to my truck later. Do they Z71s always have the branding on the side? Cause I know mine doesn't have it.
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post #309 of 318 (permalink) Old 09-09-2013, 08:36 PM
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Z71's have the RPO Code z71 in the glove box.

33's need a 4" suspension lift or some crazy tbar crank combined with a hockey puck lift.

2005 GMC Canyon Z71 4WD SLE Extended Cab
3.5L I5, 3.73 Gear Ratio, G80 Locker
231,345 Miles; Original Owner
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post #310 of 318 (permalink) Old 09-09-2013, 09:05 PM
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Well looks like I have 235/75r15...so a Z85. Does that really reduce what my Torsion bar can do in regards to a TB lift?
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post #311 of 318 (permalink) Old 09-09-2013, 09:32 PM
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Your axels are narrower and I know you have a different mounting point for your leaf springs compared to z71...not sure about other front components.

You can get height, but you need to go about it the right way. It won't be a simple TB crank and shackles.

2005 GMC Canyon Z71 4WD SLE Extended Cab
3.5L I5, 3.73 Gear Ratio, G80 Locker
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post #312 of 318 (permalink) Old 09-09-2013, 09:55 PM
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You are not necessarily at a disadvantage, but you can't get it it as tall as a Z71 with torsion bar crank that has also been TB cranked. The Z85 is lower by design.

I lifted the rear of mine 1.5", the front is level to the rear. I'm maxed out due to design limitations.

The deciding factor is to measure from the center of hub to the fender lip and not exceed I believe 24.5".

Stickers and flares are just aesthetics. They can be added/removed from any of the models. The RPO code I mentioned earlier is the deciding factor. As has Goros mentioned too.

I have 16x8.5" wheels with 265/75 tires. Around a 5" backspace and the tires stick out just over an inch. They also clear everything. If I went any larger I'd be rubbing or cutting. I had a truck that rubbed before, I'll never do that again. And I'm not going to cut my truck.

Don't forget to read the existing threads about lifted trucks via torsion bar. I feel this has gone on long enough so I'm done. The rest of the information is already out there.

Oh, I drive a 2008 Z85 4x4.
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post #313 of 318 (permalink) Old 09-09-2013, 10:07 PM
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Quote:
Originally Posted by 08Canyon View Post

Don't forget to read the existing threads about lifted trucks via torsion bar. I feel this has gone on long enough so I'm done. The rest of the information is already out there.

Oh, I drive a 2008 Z85 4x4.
Fair enough, thanks for the info. I'll continue looking around.
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post #314 of 318 (permalink) Old 07-31-2015, 07:16 PM
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For information purposes, anyone wondering what size tire to stuff under their colly? I've been running 32x11.50r15 with stock wheels for over a year. It does rub the sway bar at full lock but it's really not an issue. No premature tire wear and I drive the **** outta my truck. DO NOT CRANK TB'S OVER AN INCH WITHOUT DROPPING YOUR DIFF. Burned through 2 sets of cv axles on a 2 inch lift with no diff drop.

2008 Colorado z71 4x4
2" tb crank
2.5" rear shackles
32x11.50r15.15x7stock wheels
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post #315 of 318 (permalink) Old 01-22-2016, 09:51 PM
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coyote, if im going to off road, you wouldnt recommend a 1" drop to the diff? i want to crank the tb's probably 2"

Last edited by NewToAZ; 01-22-2016 at 11:40 PM. Reason: clarification
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post #316 of 318 (permalink) Old 01-22-2016, 11:22 PM
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id love to test and report on the one inch drop if yall are still testing
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post #317 of 318 (permalink) Old 01-22-2016, 11:50 PM
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there was a post

Quote:
Originally Posted by lilwranglergirl View Post
WTF?? Well you seem to have an answer to everything!!!!!!!!! What is your problem? You always have to jump all over everyone for asking a question with a simple answer... i.e., 12 or 24. Thanks for giving me a hard time! I guess that's expected from you tho!

there was a post, about the number of washers and size and type, i think it was six, each bolt, each side, i thunk a total of 24, look through the threads, sorry i cant help more darlin
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post #318 of 318 (permalink) Old 01-23-2016, 01:49 PM
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Quote:
Originally Posted by NewToAZ View Post
coyote, if im going to off road, you wouldnt recommend a 1" drop to the diff? i want to crank the tb's probably 2"
Quote:
Originally Posted by NewToAZ View Post
id love to test and report on the one inch drop if yall are still testing
"Coyote" hasn't logged in on this forum since 2011.

To answer your question a 3/4inch diff drop should be enough for a 2 inch torsion bar lift aND is most yout can go withrough the stock bolts. A 1 inch drop will probably require longer bolts.

This mod has been tested up to 1 1/4 inch drop already. Suspension Maxx sells diff drop spacers for 3/4 inch drop or a diff drop kit with bolts for a 1 1/4 drop. Or you can just use washers for the 3/4 inch but I would use Grade 8 washers.

2011 Colorado CC Z71 2LT 4X4 3.7L with a few mods
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