Dusty Bradford
Well-Known Member
- Joined
- May 24, 2001
- Messages
- 5,802
Posted here hoping for some advice on things to check out. I have searched the archives and found several things to check but would like some more info concerning the use of a TH-350 rather than the 400.
A friend has installed a 350 tranny behind a stout 109 V6 for TSM racing. This motor has ran for years without any trouble with thrust problems whatsoever. The car has maybe 100 miles on it after the tranny swap. We got to BG for TSM and had a few FAST tuning pulls on the trans brake and 1 full pass on low boost. On the 2nd pass the would not make any power and we found the thrust bearing gone. It has maybe 12 trans brake stalls, some as high as 20psi boost but only for a few seconds.
Could this alone cause the problem?
Basically I just need to know everything we need to check before putting the engine back in. I see where the line pressure needs to be under 200psi and the cooler inlet below 60psi. Is this the same for a T-350?
If the pressure is too high do we need to restrict the convertor feed or make pump mods?
We will have the convertor cut open and checked. We also have access to a tranny dyno and intend to put it on the dyno to check the pressures. Anything special we should check?
We do plan to drill a hole in the thrust bearing through to the oil feed so that the thrust surface gets pressurized oil.
Also, the converter to flexplate clearance was within spec.
Any ideas and comments are appreciated.
A friend has installed a 350 tranny behind a stout 109 V6 for TSM racing. This motor has ran for years without any trouble with thrust problems whatsoever. The car has maybe 100 miles on it after the tranny swap. We got to BG for TSM and had a few FAST tuning pulls on the trans brake and 1 full pass on low boost. On the 2nd pass the would not make any power and we found the thrust bearing gone. It has maybe 12 trans brake stalls, some as high as 20psi boost but only for a few seconds.
Could this alone cause the problem?
Basically I just need to know everything we need to check before putting the engine back in. I see where the line pressure needs to be under 200psi and the cooler inlet below 60psi. Is this the same for a T-350?
If the pressure is too high do we need to restrict the convertor feed or make pump mods?
We will have the convertor cut open and checked. We also have access to a tranny dyno and intend to put it on the dyno to check the pressures. Anything special we should check?
We do plan to drill a hole in the thrust bearing through to the oil feed so that the thrust surface gets pressurized oil.
Also, the converter to flexplate clearance was within spec.
Any ideas and comments are appreciated.
