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Hmmm intetresting, all the forward gear ratios are different. GM-vs-Ford models perhaps? Will have to try to find my original info source.... Are you sure there isn't a mixup with the 6S-750 which was introduced as an uprated 6 speed for diesels...

More time planing with Excell, as I know I won't be able to do the entire swap (trans, doubler, tires) at once, so a chart to see how various combinations of components during build phases would work. And to try to decide the construction sequence....

Sorry - I've been told my brain works funny before...

Not sure if I have the manual Allison someone was looking at listed - but a couple of other 6-8 speed medium transmissions are. HEAVY. Note: Was not aiming for a freeway truck, but to maintain 55 at peak torque (hills etc) so undoubtedly they will allow a M1008/M1031/M1028/M1010 etc to drive a...

Should be a direct bolt on - it was an option in 2001-2006 2500HD and 3500 Duramax (6.5?) trucks... and I am sure most of the manuals went into 4x4's although I have seen a few in fleet vehicles. I'm thinking the 205 wil fit. Will try and upload a comparison chart (excel) of the various manual...

Glad to see this thread is back on track - the discussion was aimed at non-typical manual transmission swaps not automatic swaps or typical SM465/NV4500 swaps. All are equally valid topics but for another thread.

I will be towing up to 8000# at times, and was more concerned with the gear splits than low or tall end of range gears - t-case can take care of low and ring/pinion and tire size the top end. Also will not be running an overpumped and aggressively tuned/nitrous fed high HP engine - 250 to...

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Should be OK with a 205/208 - was used in 2001-2006 GM heavy duty 3/4 and 1 tons. Approx 35# heavier than the TH400 at 230# -vs- 195# Gertag / ZF S6-560 (6 speed manual) transmission gear ratio's and percent step between them 1 4.23 67% 2 2.53...

Looks like about $1700 for a good used or rebuilt plus whatever for any adapters/mounts and driveshaft mods/clutch pedal etc...

OK - I'm clued out.. I thought that since it is a manual there is no controller. And what is so special about the speedo cable?

Anyone ever swapped in a ZF S6-650 (from a 2001-2006 GM/Chevy K2500/3500 with the 6.6L Duramax or 1999–2010 Ford Super Duty 250/350/450/550) for the TH400? Any tips? I'm guessing reworked transmission tunnel or a body lift might be needed...