Technical Tips > Transmissions - Differentials
Differences in auto gearboxes
87Z51:
As stated t700s are very fickle.
P plater with VN SS thrashes crap out of car ; no probs.Mum and Dad on sunday drive and it sh#ts itself.What kills them is torque more so than Hp.
The only way of getting any certainty is to replace the weak points;ie the input shaft drum and the sunshell.
The steel input shaft is pressed into the alum drum.Hi torque and it blows the splines out of the drum.
Sun gear shell is a piece of pressed metal that fractures around the spline.
The ultimate inputshaft / drum is A$850 ,one with a reinforced drum only is A$350.
Reinforced sunshell with torrington bearing instead of stock plastic washer and modified clutch is A$350.Upgraded only is A$110.
Sydney prices.
The two super duty parts are rated to 600Hp and 600ft/lb
A fully rebuilt T700(as in everything new , not just worn parts replaced )runs about $2500.For another $1200 , you can have a trans that will be indestructible .
Build it once and forget about it.
77CVT:
--- Quote ---....Build it once and forget about it.
--- End quote ---
......if budget allows.
Brutus - you still haven't put that thing in yet??????
RHD.68.l89:
--- Quote ---
The TH400 superseded the TH350. It is a stronger box but not as well geared as the TH350.
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Bah Bow!
The T400 box came out in the mid 60's for Buick/Caddies/Ponts and Chev got it in 68. It replaced the powerslide. In the early 70's a smaller,more efficient box (T350) started replacing the T400 in lighter vehicles. The T700 and later electronic version, 4L60E is a 4 sp version of the T350 and there is also a 4 speed electronic version of the T400, the 4L80E, mainly used in Suburbans etc.
C6s have a beefed up 4L60E designated the 4L65E but the motor has revised programming to limit the amount of torque applied;37
I have a 68 Bonneville coupe with the 400CI/T400 and 2.41 diff. It amazes most people how well it gets off the line;39
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