how do i check to see if i have 4.10 gears in my 4 speed? its an 1986 GT?

will the vin number tell me? is the 4.10 gears some kind of race gearing? is it stronger then the normal gears in handling TQ?

[This message has been edited by jeffdean42 (edited 06-20-2010).]

This is what wikipedia says about it

quote 4-speed manual All 4-speed manual transmissions were built at the Muncie, Indiana Allison plant. The 1984 production line saw two transmissions, a performance 4-speed with a final drive ratio of 4.10, and an economy 4-speed with a final drive ratio of 3.32. The V6 on the 1985 model and part of the 1986 production year came with a 4-speed with a final drive ratio of 3.65. The lower-geared 4.10 4-speed transmission showed improved acceleration, but sacrificed fuel economy.

This would say that no, you don't have a 4.10 if your tranny is stock

Manual transmission gear ratios
Year Style Code Axle 1st 2nd 3rd 4th 5th rev.
1984 econo 4 speed MY8 3.32 3.69 1.95 1.24 0.73 — 3.42
1984 perf 4 speed M19 4.10 3.53 1.95 1.24 0.81 — 3.42
1985 V6/4-speed M17 3.65 3.31 1.95 1.24 0.81 — 3.42
1985 I4/5-speed MT2 3.35 3.73 2.04 1.45 1.03 0.74 3.50
1986 V6 4 speed M17 3.65 3.31 1.95 1.24 0.81 — 3.42
1986 V6 5 speed MG2 3.61 3.50 2.05 1.38 0.94 0.72 3.41
1988 I4/5-speed MT2 3.35 3.73 2.04 1.45 1.03 0.74 3.50
1988 V6/5-speed MG2 3.61 3.50 2.05 1.38 0.94 0.72 3.41
http://en.wikipedia.org/wiki/Pontiac_Fiero

[This message has been edited by phonedawgz (edited 06-20-2010).]

quote Originally posted by jeffdean42: how do i check to see if i have 4.10 gears in my 4 speed? its an 1986 GT? will the vin number tell me? is the 4.10 gears some kind of race gearing? is it stronger then the normal gears in handling TQ?

An 86 GT would likely have a 3.65:1 4-Speed.

The only Fiero that actually got 4.10:1 gear set was the 1984 Fiero SE if you specifically ordered it. You could also get the economy one of 3.32 or something... don't remember exactly.

I had a 1985 Fiero GT 4-Speed that someone had swapped in 4.10:1 gears into. It came from another car because it even had a dipstick tube for the manual transmission also (which was kind of cool).

It was a rocket off the line. When I was just a punk, I remember doing a 6k rpm drop... it ripped off the drive-line absorber and the tires never gained traction... they just sat there smoking until I let up on the gas a little bit and then they caught. (did this without touching the brake)

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Todd,
2008 Jeep Patriot Limited 4x2
2002 Ford Explorer Sport 2dr 4x2
2002 Ford Crown Victoria LX
1987 Pontiac Fiero SE / V6
1973 Volkswagen Type-2 Transporter