Got another question about this 87 firebird I'm looking to buy.
The original owner put in a new rear end (not sure what gear ratio) . When
I test drove it, it make a kind of whirring noise. The current owner says
that a lot of aftermarket rear ends make noise when installed but are
otherwise fine. Is this a known issue with this model Firebird?
I changed mine..I hope it was right. Check it out first ..Blazer uses a posi
rear in the 4x4 that worked in mine.. lots of them at the wreckers if you
have to change the rear diff / pinion.. The blazer I grabbed mine out of was
3:73 but 3:42 is a common size. took me 2 hours to change (newbie at this )
but you could do it in1 hour if you know your stuff. cheers. I was told
newer blazer around 88? had more teeth on the spline.. good luck
What you put in was a EaToN brand Gov-Lock, Locking Rear Differential.
Not a "Posi" or "Positraction" Unit. Being a "Newbie" you doubtfully
have no idea how to properly shim it.
S-10 EaToN Gov-Lock's are the budget minded Locker for F-cars. S-10
came with gears ranging from 3.08 to 4.10/4.11 depending upon: Engine,
transmission & number of drive wheels. 4 Cylinder trucks are normially
4.10/4.11 or 3.73. 2.8 Trucks are normially 3.08 or 3.73. 4.3 4x4's are
normially 3.42. You do see the odd 3.23 geared S-truck.
When changing Differentials, ring and poinion gears you must know the
Is the Axle Spline the same? (If not you may have to order aftermarket
Will the gear set and diff work in my case? (2.73 case will not hold
4.10/4.11 gears normially unless you use aftermarket gear sets.)
Then you must know:
How to set pionion gear crush sleave depth. How to shim and read gear
wear patterns. What to torque the carrier retaining bolts to, and some
other fun facts.
I didn't get in to EXACT details about the diff. It's as good a posi wanna
be that you'll find. I'll keep everyone informed on how long the rear end
lasts. Start a pool on how long it last before it blows. I had a
friend come over this morning and he said everything is fine.. go figure.. a
licensed mechanic who has changed a 50 or so , said it all looked fine.. not
bad for a NeWbIe
It is not a "posi wanna be" It is a Locking Differential(a.k.a.
"locker"). Learn and understand the differances.
I don't set up new or new to carrier diffs my self. A buddy of mine who
has done over 500 in 20 years as a Dealer Puke, does them for me. Even
with all his experiance he has messed up a few times.
As for Licensed. Aint no such thing. There is a A.S.E. Cirtifaction
test. But that doesn't mean jack. I know pleanty of master techs I
wouldn't let change my oil, let alone touch a wrench around me.
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