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#1 |
Where's my beer?
Join Date: Oct 2004
Location: Glen Allen, VA
Posts: 1,770
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Borg Warner super t10 in place of 3 speed
My 79 Vette has it's original BorgWarner super t10 4speed in it and I just got a tremec tkx 5 speed conversion for it. I think I want to put the 4 speed from the Vette in my truck to back up the built 6cyl in it. I think I've read that it will bolt right in and even the.shifter would be in exactly the same place. The Vette has a Hurst shifter in it, so I would reuse that. What about a crossmember? Of course there is none with the 3 spd, but would I need one with a 4 spd, and if so what do I use? Looking for advice from those who have done a 3 speed to passenger car 4 speed swap. Thanks!
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70 C10, shortstep, .30 over 250,Hurst shifted 3 spd parts hauler. Holley 390, Clifford Intake, Header, ported cylinder head, unknown bigger cam. 79 Corvette L82, 4 spd, black, red interior, headers, flowmasters, and unkown bigger cam. '03 Grand Cherokee Laredo, 4.0 4x4 daily driver. 165K miles, and runs great '08 Tahoe LTZ 4x4 155K |
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#2 |
Senior Member
![]() Join Date: Mar 2015
Location: washington
Posts: 2,251
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Re: Borg Warner super t10 in place of 3 speed
Just use a cross-member for an automatic. It should mount right up and match the Borg just fine. I believe the drive-line will do the same. If you have a floor shift, which sounds like you have, it should be a fairly painless swap except for the removal of the cross-member. Access is poor and the rivets are a PITA to remove. I recently worked on a converted truck, and they used a torch to cut the center of the 4-speed cross member out. The riveted sections were still there. Looked like heck but functioned perfectly.
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#3 |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,515
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Re: Borg Warner super t10 in place of 3 speed
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The 3 speed just uses the bell housing mounts, no rear X-member. The 4 speed will mount the same. No rear X-member needed..... Just bolt it in, in place of the 3 speed. .
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#4 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,626
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Re: Borg Warner super t10 in place of 3 speed
Leave the crossmember in place with the bh and hang the t10 onto the bh. The t10 is 20 lbs lighter than the Saginaw.
Depending on your t10’s first gear ratio you might be losing some gear reduction. Another thing is to check the input shaft bearing housing diameter. |
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#5 | |
Senior Member
![]() Join Date: Jul 2000
Location: North Texas
Posts: 3,499
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Re: Borg Warner super t10 in place of 3 speed
Quote:
As for gear ratios, the Saginaw 3-speed has at least three different gearsets. The base six-cylinder engines have the lowest first gear ratio for better torque multiplication. The 292 six (and later the 305) got the next lowest, and then the 350 and big blocks got the tallest.
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Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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#6 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,626
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Re: Borg Warner super t10 in place of 3 speed
And now that I thought about it, it’s likely the shifter location isn’t the same. IIRC the t10 is a couple inches more rearward. Puts the handle right under the seat.
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#7 |
Senior Member
![]() Join Date: Jul 2000
Location: North Texas
Posts: 3,499
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Re: Borg Warner super t10 in place of 3 speed
About the gear ratios, I found the info below on the 3-speeds. 0-3 are the number of grooves on the input shaft. I would guess your six-cyl trans is 3.11 or 3.50, assuming it's original.
.................................1st 2nd 3rd Saginaw 3-speed – 1 2.54 1.50 1.00 Saginaw 3-speed – 0 2.85 1.68 1.00 Saginaw 3-speed – 2 3.11 1.84 1.00 Saginaw 3-speed – 3 3.50 1.89 1.00 So compare total torque multiplication (1st gear ratio X rear axle ratio) to see which one will work best.
__________________
Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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