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Old 07-26-2020, 09:54 PM
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Car barely made it up the hill (transmission issue)

Hi guys, on my way back from a 60 mile trip I was going at about 50-60 mph on the highway and the car seem to be running ok while the road was flat but as soon as I got up to a hill I felt the car loosing power and then the tach started bouncing at about 3k RPMs and the car barely made it up the hill. after that point I drove another 20 miles and I noticed that every time I tried to accelerate the engine would rev up but the car barely gained any speed. Does this sound like a bad torque converter issue or is my TH350 trans just trashed? About 2 weeks ago I added a bottle of Lucas Transmission Fix cause I had previously experienced slight slippage and it was low on oil. Thanks for any suggestions



Setup: 383 Stroker with a stock TH350

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Old 07-26-2020, 10:47 PM
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Converter issue would never get better with any additive or fluid level raised....if the converter was messed up it would stay messed up or get worse, it would never act better for a while and then be worse again.

Sounds like a worn out transmission issue to me....those snake oil additives rarely help for long if they help at all.

Check the fluid level before you get carried away, it may have just leaked enough to make it low on fluid and make it slip again.
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Old 07-27-2020, 07:28 AM
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You have already burned things to the point that the clutch material is all but gone. When clutch material overheats, it gets a glaze over it and it's not a self-healing issue with any kind of additive. Sometimes, a fresh load of fluid and filter might squeak a bit more time out of it, but it usually doesn't take long for the new fluid to be overheated by the clutch/steels that are already terminal. Best to pull it apart now and stop trashing your hard parts by continuing to operate it. Seals, clutches, steels, gaskets are the cheap parts of a transmission. When you start tearing up hard parts, it can get expensive really fast.
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Old 07-27-2020, 09:08 AM
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If a transmission is low it is because it is leaking. Run a rag over it including the cooling lines to find where it is leaking from. Fill it run it for a bit and check the next day to find the leak.

When they get low they can easily get hot.

Did you smell burnt toast at any point going up the hill?

If it is slipping it is often beyond saving and needs to be rebuilt.

I would talk to a transmission shop. Swap out the old for the new or rebuilt one doing the removal and install myself (including swsping tailshafts if needed) to save several hundred in labor. If your iffy about the removal or install or it will void any warranty then having a shop do the install may be a better option.
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Old 07-27-2020, 08:01 PM
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THM350 sounds like direct clutch is toast. Usually heat build up and fluid loss cooks the direct piston seal, and then pressure leak off allows slippage. Thing get expensive quick from there.


also make sure the modulator isn't sucking fluid out.
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Old 07-28-2020, 07:02 PM
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Considering the day this happened was 98* and I drove about 70 miles total..I'm going to do the easiest thing first and just change the fluid and hope I can squeeze a few more miles out of this tranny.



Thanks for the response guys
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Old 07-28-2020, 11:36 PM
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I suppose this is the combination of frisky and fresh 383 dating an old pensioner TH350 bolted to it.

Figure a rebuild or replacement is in order.

Modern transmission oil and high temps donít make good partners either. You almost canít run modern Dexron too cold.

My 700R4 rebuild runs all Ďracerí parts to which feed them synthetic Type F.

Bogie
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Old 07-29-2020, 08:13 AM
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Quote:
Originally Posted by 47 Ford Coupe Delux View Post
car seem to be running ok while the road was flat but as soon as I got up to a hill I felt the car loosing power and then the tach started bouncing at about 3k RPMs and the car barely made it up the hill. after that point I drove another 20 miles and I noticed that every time I tried to accelerate the engine would rev up but the car barely gained any speed.
When the engine revs up, does it run free to 5,500+ RPMs? Or just downshift and rev up to proper RPMs, but no power? It kinda sounds like a clogged fuel filter limiting power/speed to 60 MPH no matter what gear you're in...
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Old 08-01-2020, 02:20 PM
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When the engine revs up, does it run free to 5,500+ RPMs? Or just downshift and rev up to proper RPMs, but no power? It kinda sounds like a clogged fuel filter limiting power/speed to 60 MPH no matter what gear you're in...

it wouldn't pass 3k rpm, almost felt as if it was hitting a limiter. Also in my driveway when I try to put it in reverse it doesn't move, not even when I rev up the engine. Also if I put it in drive and hit the gas it barely moves forward. A few weeks back when I checked the oil and noticed it was low I saw some gunk/slimy stuff on the tip of dipstick.
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Old 08-01-2020, 02:29 PM
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Quote:
Originally Posted by 47 Ford Coupe Delux View Post
it wouldn't pass 3k rpm, almost felt as if it was hitting a limiter. Also in my driveway when I try to put it in reverse it doesn't move, not even when I rev up the engine. Also if I put it in drive and hit the gas it barely moves forward. A few weeks back when I checked the oil and noticed it was low I saw some gunk/slimy stuff on the tip of dipstick.
Sounds like both engine and transmission problems!
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Old 08-01-2020, 02:57 PM
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Sounds like both engine and transmission problems!

I'm 100% sure the engine is fine. Transmission has been slipping and having issues for a while and it's been getting worse and I knew it was just a matter of time before it died. I'm just curious if I should even bother changing the oil and filter to try and keep it running for a bit longer. Or just replace it. I'm not even sure if this transmission after rebuilt is even able to handle the 475 ft lb of torque the engine puts out.
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Old 08-01-2020, 03:20 PM
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Thatís a lot of torque for a TH350, torque is the transmission killer more so than horsepower.

To manage nearly 500 ft-lbs you need a well built high performance TH350 nothing stock spec will stay together.

Probably a better base to build on is to start with a TH400. If you would like some overdrive and are willing to invest in a transmission controller then a 4L80E would be a nice addition.

Bogie
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Old 08-01-2020, 06:43 PM
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Quote:
Originally Posted by 47 Ford Coupe Delux View Post
it wouldn't pass 3k rpm, almost felt as if it was hitting a limiter.

I'm 100% sure the engine is fine.
Something isn't jiving here...
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Old 08-01-2020, 06:51 PM
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Quote:
Originally Posted by BuzzLOL View Post
Quote:
Originally Posted by 47 Ford Coupe Delux View Post
it wouldn't pass 3k rpm, almost felt as if it was hitting a limiter.

I'm 100% sure the engine is fine.
Something isn't jiving here...
So true. If the transmission was stiff in that joker would run the tachometer up to the Moon!
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Old 08-01-2020, 07:54 PM
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Quote:
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Something isn't jiving here...



So are you guys saying this doesn't sound like a transmission issue? I mean what else would cause the engine to rev up and not move in drive or reverse?
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