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#26 | |
Registered User
Join Date: Jul 2008
Location: Lawrenceville
Posts: 32
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Re: **Help**Having trouble figuring out how to change rear Differential
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#27 |
I wish I was a cowboy
![]() Join Date: Apr 2008
Location: Rohnert Park, CA
Posts: 409
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Re: **Help**Having trouble figuring out how to change rear Differential
If you wanna hot rod it, go lower [numerically higher]...getting a 4000 lb truck off the line like a hot rod with a 3.07 is gonna take a lot of grunt, like 502 cubes of grunt...If you're running a small block, and you wanna launch like a hot rod, run short/low/numerically high gears: 3.73 would probably be a reasonable start (good launch but 31-3200 rpm at 65 with a stock height tire and 1:1 tranny). Don't forget all the other hot rod stuff, though...big cams & heads usually like short/low/num. high gears, big stall converters, and tough trannies. But, they can be a pain in the a$$ to drive every day.
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-Kris Met list: Cyclone,Wilson,TranzAm,extd56,hotrodhomi,mnky30,Rokcrln,Brad,JerryJones(well, his truck anyway). |
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#28 | |
Registered User
Join Date: Feb 2004
Location: Albany, NY
Posts: 522
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Re: **Help**Having trouble figuring out how to change rear Differential
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becuase, this guy has to do his FIRST! god forbid you don't do it right the first time (who does?!?!) because the u-joint at the tranfer case, for your rear driveshaft, might break its caps... and your rear driveshaft might become a giant pogo stick and vault your truck into the air at 20 mph. or you could just be coming off the highway and hear a BANG, and have no more forward movement, and a differential full of metal chunks. at least, have someone show you how to do it first. this is stuff that trained mechanics can do well, like tearing into a tranny...
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#29 |
Registered User
Join Date: Aug 2007
Location: West Hills, California
Posts: 679
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Re: **Help**Having trouble figuring out how to change rear Differential
If you don't feel comfortible don't do it. It's almost sounds like my local drivetrain shop when they are trying to scare a customer into them doing the work. They wanted $450 to set up a 8.2 rear for me. Ever since I am doing my own.
You will know with in first 5-10 min during the break in if something is not right. Last edited by Pont406; 01-12-2009 at 11:46 PM. |
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#30 |
I wish I was a cowboy
![]() Join Date: Apr 2008
Location: Rohnert Park, CA
Posts: 409
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Re: **Help**Having trouble figuring out how to change rear Differential
Pont406: Can you post up instructions on how you did yours:
-Where you got the appropriate lash and spacing specs -Anything unique about pressing on the new bearings -HOW to set the gears Maybe this is the wrong thread...sorry for hijacking!
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-Kris Met list: Cyclone,Wilson,TranzAm,extd56,hotrodhomi,mnky30,Rokcrln,Brad,JerryJones(well, his truck anyway). |
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#31 | |
Registered User
Join Date: Jul 2008
Location: Lawrenceville
Posts: 32
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Re: **Help**Having trouble figuring out how to change rear Differential
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I wanted to provide an update and thank everyone for their help. I found a 3.07 rear end and put it on my truck. The truck ride is great now and I can drive on the highway with out feeling like the engine is going to explode. Special thanks to board member Kayotic who find me on craigslist for the needed part. ![]() |
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#32 |
Never Ending Projects
Join Date: Jul 2006
Location: San Diego, CA
Posts: 3,836
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Re: **Help**Having trouble figuring out how to change rear Differential
Awwww... can we feel the love.
![]() Good job and hey... post some pics. ![]()
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. 1965 C10 Panel, ![]() 1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD 1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD We were given two ears and one mouth for a reason... listen twice as much and speak half as often... |
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#33 |
Registered User
Join Date: Mar 2008
Location: Lawrenceville, Ga
Posts: 300
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Re: **Help**Having trouble figuring out how to change rear Differential
Damn bro, I was intregued about this thread because I recently sold a rear end out of a '68. I was just begining to wonder if I should have kept it... Then I continued reading and saw my name.
Does that make me a celebrity? I am glad it has helped, and hope you get to beat the crap out of it for many years. And yeah, Show us some pics of your ride when you get a chance, I know we spoke a about it when you drove it here, but it was too cold for too much chit chat. - even if it is chevy street trucks (being laid off made me soft). Last edited by Kayotic; 01-30-2009 at 10:47 PM. |
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#34 | |
Registered User
![]() Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,595
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Re: **Help**Having trouble figuring out how to change rear Differential
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B. On this style rear end, unless you have the proper tools (meaning measuring tools. There is a lot of chance of error. The pinion depth has to be set correctly and then the ring gear and carrier have to be shimmed properly to get the proper lash. If you don't have a shim assortment readily available you end up buying a shim pack to be able to do the adjustments. c. If you change from a 4something ratio to a 3 something ratio you have to change carriers or buy one of the special ring and pinion sets that has a ring gear with the proper thickness to compensate. I vote for going out and seeing if I can buy a complete rear end with the desired gear ratio. Around here most of them go for under 150 and often you can find a posi with the ratio you want for that. I just picked up a 3.55 Dana 60 with a posi for my 71 GMC 3/4 ton for 150.00 I'm getting away from the 4.11 set up that is in the truck now because most of mydriving is at highway speeds and I can still tow my boat with the 3.55. The first thing I would do is get under the truck and check the tag and see what the current gear set is. Then I would decide how I want the truck to perform. Do you want it to be quick off the line or do you look for good highway speed and easy cruising on the freeways? Last edited by mr48chev; 01-30-2009 at 10:49 PM. |
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#35 | |||
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: **Help**Having trouble figuring out how to change rear Differential
Those weekend TV shows do a lot of people a dis-service by showing a very simplified version of gear swapping. It is not as easy as they make it look, but no instruction on TV ever is now is it?
My advice as always is to pay someone to do it. This is a job that most guys will only ever need one time. It is not worth the time, trouble, cost of tools, and frustration to get this done. Paying also gets you a warranty which you will never get doing the install yourself. Quote:
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Imho the pattern pic posted in this thread is not correct. Whatever was used far marking compound was applied too thick. It looks like lithium grease, which smears too much. The contact looks too long and too high on the teeth. The edges of the pattern should never be sharp. This is a very exacting thing which is also somewhat "art" and interpretation. The set-up numbers should be on the packaging or engraved directly on the gears themselves. These come from the person that originally matched them at the factory. It is a hands-on process. The idea is that you are trying to get back to exactly where they had them. It takes a lot of patience, an assortment of shims, a dial indictor, a torque wrench, marking compound, and synthetic lube at bare minimum....but guidence and/or experience are best.
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Bad planning on your part does not necessarily constitute an instant emergency on my part.... The great thing about being a pessimist is that you are either pleasantly surprised or right. ![]() |
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#36 |
Registered User
Join Date: Nov 2007
Location: Sacramento California
Posts: 194
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Re: **Help**Having trouble figuring out how to change rear Differential
I was in the same boat. My truck had high gears. It was a kick off the line but I couldn't run down the freeway @ 70. I went out to the wrecking yard and picked up a rear end with 3:07s. I brought it home put it up on saw horses, cleaned and painted, new axle bearings and seals, new brakes and one day just made the swap. I cant tell you how much easier it was to do the work on saw horses rather then under the truck.
With the old rear end I will someday put it up on saw horses and do a total overhaul using a posi and all new parts but for now I'm crusing. I use the freeway a lot so I think I'll stay with the 3:07s but I think gears in the 3:50 range would get you off the line and down the freeway. The 3:07s are no slouch though they will get you moving.
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69 sweet long fleet, David |
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#37 | |
Registered User
Join Date: Jul 2008
Location: Lawrenceville
Posts: 32
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Re: **Help**Having trouble figuring out how to change rear Differential
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No worries, it was cold and I completely understand ![]() ![]() also, I find it really funny when I see people faces after I pass them on the highway, My truck is not painted yet and I know they are thinking "how is that guy passing me in that truck".... ![]() |
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#38 | |
Registered User
Join Date: Jul 2008
Location: Lawrenceville
Posts: 32
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Re: **Help**Having trouble figuring out how to change rear Differential
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Quick question, In your pic of the rear end (which looks very nice) is the sway bar the long black bar thats screwed from the right side of the gear cover then goes to the left on to the frame? |
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#39 |
Rottenwood Garage Member
Join Date: May 2005
Location: Marietta, Georgia
Posts: 4,321
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Re: **Help**Having trouble figuring out how to change rear Differential
"Fourthly (is that a word?), changing gears is easy but the backlash and spacing needs to be set by a professional before you drive it very far or you'll tear them up quickly."
I was waiting to see how long it would take for someone to come up with the IMPORTANT INFO!
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2004 Chevrolet Suburban C1500 2001 Chevrolet 2500HD Crew 6.0 1999 Harley Davidson Electra Glide 1972 Chevrolet C-20 Custom Camper "Dump Truck" 1972 Chevrolet C-20 Suburban "Big Green" 1969 Chevrolet C-50 Wedge Hauler "Leonidis" 1966 C-10 2x4 short fleet 327 4 speed "Race Truck" 1952 Plymouth Cranbrook "Rican" (my grandfathers) 1931 Ford Model A Coupe "Black Beauty" 1930 Ford Model A truck "Club Cab" 4x4 Rottenwood Garage and Speed Shop.....where everything must be racy! It's not just a hobby..It's a LIFESTYLE!!! Thanks for nothing Barrett-Jackson You cant fix stupid or teach accountability! Time wasters, looky Lous and tire kickers are everywhere! |
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#40 |
Registered User
Join Date: Feb 2004
Location: Albany, NY
Posts: 522
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Re: **Help**Having trouble figuring out how to change rear Differential
like pinion bearing pre-load, pattern maker brands, correct pattern pictures, or run out depth on a dial indicator?
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