Question about 1988 Pontiac Firebird

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Speedometer reads too high

I have an 89 Formula 350. I just swapped the rear from an open diff 2.73 to a limited slip 4.10. now at 70mph it reads 100mph. I can't find a sleeve to fit the larger speedo gear. anyone know where I can find one or suggestions on how to ditch the governor?

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With the difference in ratio, the drive wheels rotate at a faster rate of RPM. you will also notice that the motor revs higher RPM as well and that will not change. However, you may need to change the speedo cable to resolve the speedometer discrepancy.

Posted on Sep 17, 2009

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Was stuck using 4 lo. Had 3 wheels spinning except l/rear,just sat doing nothing.


4 wheel drive is unfortunately a bit of a myth as in 4 wd any two wheels with no traction will not move you any where
so if you have both rh side wheels slipping,
go no where
left front right rear ,
going no where
the wheel that was not turning was the only wheel that had traction but through the differential action the other wheel spun faster
now with limited slip diff centers , both wheels have to turn as the differential action locks up so yes you would be going some where.
posi traction is the same idea
vehicles that have limited slip diffs are Toyota and Nissan as standard with some Nissans having limited slip diffs in the front drive axle as well
now if you are doing a lot of 4wd driving in adverse conditions , you need to have locker diff centers ( available from off road shops ) as they physically lock the diff actions ( with the flick of a switch) with the result if all 4 wheels are spinning and you are not moving , your stuck but if one wheel has traction you keep moving

Nov 12, 2015 | Cars & Trucks

1 Answer

I have a 97 vzj95 prado 3.4lt v6 Recently the front diff seized and I've replaced it but now on turns while accelerating I'm hearing a clunk from the rear diff... Is this a wind up issue? Thanks


Yes it is a wind up of the axles and not the drive shafts. Your car has a limited slip diff and it is locking up.
When you are accelerating the diff locks up and your wheels are rotating at different rates while turning. This causes the axles to twist until the pressure causes the Limited Slip Diff to slip.
My guess would be that someone has changed the diff oil with non Limited Slip Diff oil.

May 12, 2015 | Cars & Trucks

1 Answer

Growling from rear end on left or rite turns jeep gr ch


pull the drain plug and check for metal bits on the magnet. The only items working when changing direction is the side gears in the diff of the diff locking system in a limited slip diff. Failure is very rare for these parts unless there has been incorrect oil used in a limited slip diff. Jeep diffs use a "C" clip on the end of the axle inside the side gear and it is possible that one or both clips have become dislodged and and become immeshed in the gears

Oct 21, 2014 | Cars & Trucks

1 Answer

Inaccurate Speedometer


Your rear diff has a different ratio gear in it. Find out what ratio gear your car came with, remove your diff gear, and replace with same ratio that it came with from factory, that will fixya.

Dec 03, 2013 | 1994 Pontiac Firebird

1 Answer

Hello, with all 4 wheels off the ground,engine running and in gear only 3 wheels are turning. The right front does not. is this normal?


Unless you have a positraction rear differential, I'm surprised that even three are turning! Four wheel drive is really two wheel drive because both differentials are "open" type. In an open diff, only one wheel has power at any given time. With a positraction, or "limited slip" rear diff, both rear wheels push with fairly even force but the outer wheel is allowed to slip when going around turns. Only true four wheelers have either a limited slip on both ends or "locked" units but it is impossible or really difficult to drive anything like that on the street. If you hold the left front wheel from turning unless the locking unit is broken, the right front should turn.

May 10, 2010 | 1998 Jeep Grand Cherokee

1 Answer

4wd is it working properly or not


No. Power will transfer to the wheel with the least amount of traction unless the differential is a limited slip diff. You likely have limited slip (Positraction) in the rear diff so both wheels will spin. The front axle doesn't have posi so only one wheel will spin. (3 wheels spinning)

Apr 10, 2010 | 1994 Isuzu Trooper

1 Answer

I need to know what ratio the axle in a 2006 f-350 has in it. i can not find the decoder....HELP PLEASE


The following lists the gear ratios on rear axles.
  • 37 — 3.73 non-limited slip
  • 3L — 3.73 limited slip
  • 41 — 4.10 non-limited slip
  • 43 — 4.30 non-limited slip
  • 48 — 4.88 non-limited slip
  • 4L — 4.30 limited slip
  • 4N — 4.10 limited slip
  • 4W — 4.10 limited slip (ambulance package)
  • 53 — 5.38 non-limited slip
  • 5L — 5.38 limited slip
  • 8L — 4.88 limited slip

Feb 01, 2009 | 2006 Ford F 350 Super Duty

1 Answer

Rear limited slip diff test


hi jack it up with one of your rear wheels off the ground the other on the ground if your diffs locked up it will stall and try to move your motor if its ok the wheel will just rotate the wheel that is off the ground rare to have a locked diff though plus if you you go round in a circle a right one then a left one it should go smoothly in a circle if the back end sways make a note of is it both sides or just one side yates210456

Oct 09, 2008 | 2008 Subaru Forester

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