T5 conversion/swap
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Elder User
Joined: Jan 2009
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From: Blue Eye, mo. hwy 86 & JJ
T5 conversion/swap
Okay 85 f150 300i6 currently a t-18 8.8 with 3.08 gears. Im wanting a 5 speed, sounds like the t5 is cheap plentiful and has good gears. If I understand correctly I'd need a s10 tranny for gears and shifter location but a small block ford bell housing. And swap the input shaft for a 10 spline 11' one. My t18 already has a hydraulic clutch. What I don't know is driveshaft length and what to do for a crossmember. Anybody ever done this? Will the shifter clear my bench seat? Will the t5 withstand a mild 300 build? What about the speedometer? Thanks as always guys!
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Joined: Apr 2004
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First, if you are going to tow or haul heavy stuff, I don't think the T5 will last. It is nowhere near as strong as that T18.
Some info in these. I was going to do this in my '85 but it never happened. You need an adapter due to input shaft length.
The Ultimate T-5 Swap Article
T5 Swap, T5 Conversion, Mustang T5 Swap, Auto to Manual Transmission - FordMuscle
Adapter here:
Inline-6 Transmission options using a TREMEC T5
I had a link showing a guy doing the conversion, but it is not available or is gone.....
The Cobra Mustang trans has the highest torque rating, and a decently low first gear. The T5 parts interchange easily, thus the Chev S10 tailshaft housing can be swapped on there for a different shifter location.
You will have to fiddle with the cross member, but nothing major iirc.
DS is a question mark--don't know.
See if those links lead you closer to more gears.
Some info in these. I was going to do this in my '85 but it never happened. You need an adapter due to input shaft length.
The Ultimate T-5 Swap Article
T5 Swap, T5 Conversion, Mustang T5 Swap, Auto to Manual Transmission - FordMuscle
Adapter here:
Inline-6 Transmission options using a TREMEC T5
I had a link showing a guy doing the conversion, but it is not available or is gone.....
The Cobra Mustang trans has the highest torque rating, and a decently low first gear. The T5 parts interchange easily, thus the Chev S10 tailshaft housing can be swapped on there for a different shifter location.
You will have to fiddle with the cross member, but nothing major iirc.
DS is a question mark--don't know.
See if those links lead you closer to more gears.
Junior User
Joined: Sep 2010
Posts: 59
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From: Carrollton, TX
Find a ZF5-342 with the small block pattern. It came behind the 300 and 351 in F250-350. It should be a bolt in. For light duty the Mazda 5 speed that came in the F150 with the 4.9 will work and be the cheapest option of all. Again, both should be close to bolt in installs.
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