T5

[Straight six]

So I have a 1978 gmc c15 with the 250 in it with offenhauser intake four barrel carb and headers the miserable three speed sucks on the highway no over drive just checking if I can put a 1986 s10 2.8 t5 transmission in it for that good overdrive I hear people doing it would it hold up behind the 250 with the mods I have on it please help
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[MalibuSSwagon]

Did you not just post an almost identical thread.

Anyways I'd use a Camaro V8 T5 as it has much better gear ratios and stonger overall, you can install the S10 tailhousing on the back. Also I would use the complete S10 shifter.

This is how

http://www.inliners.org/Jack/T5tech.html

[Straight six]

Yes I did just post a similar question but still not getting a real answer will the 2.8 s10 t5 work on my engine with mods I have thanks
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[MalibuSSwagon]

1986 is a non-world class design T5. Torque rating is 280 ft-lbs. 1st gear is 3.76 for a V6 T5. Bellhousing bolt pattern is GM style.

GM used the Borg Warner T5 5-speed overdrive transmission in thirdgens starting in late 1983. It replaced the Muncie Super-T10 4-speed.
1983 to 1987 was the first design, rated at about 280 ft/lbs of torque. 1988 to 1992 was the second design, also called the World Class T5. It featured revised synchros and Timkin bearings, and was rated around 300 ft/lbs of torque. T5 transmissions were used only behind V6's and 305 V8's. The TPI 350 V8 put out more torque than the T5 was rated for, so GM did not offer that combination to the public. (Any replies about comparisons to Corvettes, or emissions reasons, etc, will be deleted)

The T5 offered in V6 engines has a different bellhousing to match the V6, as well as a 10 spline input shaft, compared to the V8's 27 spline input shaft. The V6 T5 also has different gear ratios. The V8 T5 usually has a 2.95 first gear, although I have heard rumors of a 2.75 first gear. 5th gear is .63 in the cars with 3.08 rear ends, and .75 in the cars with 3.42/3.45 rear ends. I have also heard of a .83 5th gear in the 1LE cars.

For 3.42/3.45 rear ends, you need a 7 tooth drive gear and a 19 tooth driven gear to make the speedo accurate.
For 3.70/3.73 rear ends, you need a 7 tooth drive gear and a 21 tooth driven gear.
For 3.08 rear ends, you need a 9 tooth drive gear and a 23 tooth driven gear.

The 83-87 T5's recommend gear oil for fluid, while the 88-92 T5's recommend ATF.

Mustang V8 T5's are different externally, with a 10 spline input shaft and a straight up bellhousing, while the F-body V8 T5 is a 27 spline input and slanted to the right about the 2 o'clock position. They are not compatible with each other externally, but the gears inside are the same. The speedo gears are different as well.

Source: http://www.thirdgen.org/techboard/tr...ything-we.html

According to this article, the V6 T5 should also have a 10 spline input shaft, so you may be able to slide this right into your bellhousing, utilizing the same clutch as the 3 speed. I"m not sure if its a 10 spline clutch for the 3 speed, so you'd have to do a bit of your own research there