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Tranny Slippage.....

R

RustBuket

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Well my tranny slips if I pin it while in 4-lo on a high traction surface.....Do you think this means my tranny is going to be dead soon or just take it easy when I'm in 4-lo? I'm going to change the fluid and filter to be safe and clean out the pan. Should I start lookin for a new tranny now? Its a TH350 btw. I also wouldn't mind switching to a SM465 but realize I'd probably have to swap d-shafts as well. What do u think?
 
1. You probably checked already but how's the fluid level?

2. Make sure the vacuum modulator hose didn't come loose.

Your T-case is in 4low so what transmission gear are you in when the slipping occurs D, L2, L1? If your in L1 and it's slipping during the 1-2 shift then:

Low fluid level
low oil pressure
faulty 1-2 accumulator
faulty 2-3 accumulator
front pump malfunction
intermediate clutch malfunction

as taken from HP books Turbo Hydramatic 350 Handbook.
 
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could be the torque converter. Im assuming you mean pin it in 1st gear, 4Lo.

The band could be severely worn as well. maybe its just first gear, but it could be others as well...
 
slips in 4 low??

Strange--the tranny should be MORE likely to slip when the transfer case is in "high" range---putting it in "lo" REDUCES the amount of torque needed to spin the driveshafts by at least 50%...I'd think you would notice any "slippage" much more driving uphill on the street in "high" range if it were a tranny problem.. :confused: ....I've driven trucks with "blown" trannys home in "low" range that would hardly even move the truck in "high" range before..maybe the "slippage" is in the T-case??.. :crazy:
 
How could the t-case be slipping? I checked the level a week or two ago I guess I'll check again...if its just low fluid I'm going to be a little embarrassed.... :blush: Maybe its low fluid and when you gun it in first, all the fluid sloshes to the back away from the pickup or something? Just a guess.
 
You can get Lucas NAPA up here. I think Canadian Tire also sells it.

I would check your symptoms again before adding anything to the fluid.
As diesel4me said in his reply... You should notice the slip in high range more than in low range.

As for the tranfercase slipping, I guess it is possible but not very likely.

I have never tried any cranny additives, the rumors that I have heard is that they are big nail in the trany’s coffin. Supposedly they turn seals and friction material soft. The word used I believe is mush.
Please don’t take this as gospel as I have never used any additives myself
 
Now that I think about it, NAPA does have it. They have that little thing you crank with the 3 gears to compare how much better the lucas oil coats the gears and carries up with them.
 
I have run the lucas oil trans slip stuff in a couple of tranies and have had no problems with it. All it is mostly is a higher viscosity tranny fluid. I put it in every time I change tranny fluid cause it makes ones that aren't slipping shift harder.
 
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