Borg Warner T10 vs Toploader

[xb-60]

Originally Posted by DanEC

I don't know why but the T10 they used in the Shelby was aluminum case so the weight factor is probably a good guess. Interesting but I think Ford installed Toploaders in similiar, non-Shelby Mustangs at the same time.

Yes I agree, the T10 housings going into GT350s were aluminium, and yes the standard Mustangs going down the same line, with the same engine fitted, were fitted with Toploaders.
Can anybody comment on the torque capacity of both gearboxes?
Cheers,
Glen

[DanEC]

I doubt that anyone ever tagged them with a specific power or torque capacity back then. I would think the Toploader could handle more torque than a regular T10 - at least with the big input/output. I wasn't until the Super T10 came out that it was regarded as a HD transmission.

[jwd]

With the exception of the GM Saginaw 4 speed, the T-10 is the weakest 4 speed on the planet. If you have decent power and a little bit of traction, the main shaft will twist just ahead of the yolk. I've rebuilt many of them and would conservatively say that 90% had twisted main shafts. Another weak point are the synchros. Unless you rebuild them using Torque-Lok sliders, you're guaranteed they will jump out of gear on deceleration. They are okay for a cruiser but I wouldn't put one in anything I planned on "driving hard".

[xb-60]

Originally Posted by jwd

With the exception of the GM Saginaw 4 speed, the T-10 is the weakest 4 speed on the planet. If you have decent power and a little bit of traction, the main shaft will twist just ahead of the yolk. I've rebuilt many of them and would conservatively say that 90% had twisted main shafts. Another weak point are the synchros. Unless you rebuild them using Torque-Lok sliders, you're guaranteed they will jump out of gear on deceleration. They are okay for a cruiser but I wouldn't put one in anything I planned on "driving hard".

...hence my surprise that for a car that was to be raced, a T10 was specified over a Toploader.