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jasonhnova 08-26-2012 01:06 PM

T-350 trans troubles
First off I'll say I googled this for hours but no one has the same problem. This is my setup th350 in 64 nova, tranny is by redneck racing they say it's good upp to 850hp, has hard drum sprag ect, manual valve body, trans brake. This was how my night went at the street legal drags first run 11.46 et on motor, next run 10.58 on nitrous. Both runs went perfect, but my next run I got on the transbrake and when it released the tranny seamed to just slide, got back to the pits and smelt the fluid, it smelt fine. I decided to drive it home and thats when I realized I only have drive(3rd gear) as my forward gear. I can put the car in first and drive on the freeway like I'm in drive, it labours from a stop but once I'm up to speed it pulls hard with no slipping. Reverse, park and nuetral work great, but no matter what forward gear I shift into its still in drive (I have manual valve body) shifting up or down makes no difference. My burnout proceed is as follows line lock on and 3 secounds of burnout at 5000 rpm in secound (starting burnout in secound, manual valvebody)then release line lock, keeping on gas untill it hooks. The burnout on the run that went bad seemed fine but wondering if something broke when it hooked. The tranny makes no noise and drove home just fine except I was in drive all the which is 99% freeway driving. Any help would be appreciated as my tranny knowledge is vey limited.

Crosley 08-26-2012 01:14 PM

One item, start the burn out in 2nd gear and shift to 3rd gear. DO not allow the tires to ''hook'' while in 2nd gear. That is very hard on the 2nd gear sprag.

Next item, the trans is stuck in 3rd gear from your description. I suggest you remove the pan and look for debris, check shift linkage ( although it sounds like it's OK).

There may be damage in the direct clutch drum or 2nd gear sprag that is also on the direct drum.

850 hp is beyond the power limit of a T-350 in my opinion. I hope your trans has billet input, 36 element sprag for 2nd gear

jasonhnova 09-29-2012 05:53 PM

1 Attachment(s)
so I have pulled the tranny now looked in where the converter seats into the pump, the tangs are broken off the pump gear! I have driven the car for 2 years with this tranny, this th350 has 500 hundred miles and 10 passes at the track (10.5 sec - 11.5 sec). I thought if the pump wasn't being driven that the car would not move? most pump tangs are broken during install, but I couldn't have broken them during install and driven for 2 years or could I have? Before I pulled the tranny it only had reverse and drive but no low or secound. A couple of people have suggested that I broke the intermediate sprag as this tranny problem happened after my burnout. I have looked at sprag and it looks fine to me. I'll post a picture (this is a 36 element sprag if I'm correct).

jasonhnova 09-29-2012 06:14 PM

I have a spare th350, can I just take the center gear in the pump with the tangs and throw it my pump or should swap the whole pump, are gears a matched set?

Crosley 09-30-2012 01:27 AM


Originally Posted by jasonhnova (Post 1594942)
I have a spare th350, can I just take the center gear in the pump with the tangs and throw it my pump or should swap the whole pump, are gears a matched set?

Pump gears are produced in different widths. You need to measure the width of the gears... widths were .721 , .723 and .725 thick for the common sizes of a T-350 non lock up trans

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