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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What oil must i put in the diff of a ford 4000 tractor with the oil pump for lift inside the diff


80-90 oep diff oil unless it is a limited slip diff in which case you use special limited slip diff diff oil
don't know if it is limited slip diff diff
you can check by jacking up the rear end and having a friend turn a rear wheel
by holding one wheel the other wheel will be turning in the forward direct as that is what limited slip diffs do diff do ( both drive )
other than that call your local manufacturer service center and ask

Mar 15, 2017 | Cars & Trucks

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I HAVE A TOYOTA HIACE HIGH TOP 1998 2.4 PETROL 5 SPEED MANUAL. I WOULD LIKE TO KNOW WHAT TYPE OF DIFFERENTIAL OIL SHOULD I USE THANKS SUE


90 w-140 O E P oil unless it is a limited slip diff in which case use 90w-140 limited slip diff oil

Jan 19, 2017 | Toyota Cars & Trucks

1 Answer

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

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

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