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View Full Version : Could it be low tranny fluid?


godtool
04-03-2007, 10:45 PM
My th350, was not backing up in reverse very well lately. Now suddenly today I need to get the revs way up before it starts to back-up. I shift it into reverse, but then need to rev it up before it even starts to move backward, but before it moves backward the truck jerks backward suddenly and violently (i think I hurt my neck) and then backs up nicely. Truck moves forward normally in forward gears. And also just today on the highway it does not want to shift into 3rd anymore. I replaced the vacuum pod and downshift cable last month. Tranny worked awesome until today. I noticed I have tranny fluid leaking out very slowly from somewhere. I'll check the level in the morning and where it may be leaking. :( :confused:

Mud Slinging Dumb Fawker
04-03-2007, 10:47 PM
i might be the level but it sounds like a solinoid could be going

godtool
04-03-2007, 10:55 PM
Solenoid... does that mean the tranny needs to come out, or can it just be fixed by dropping the pan?

Mud Slinging Dumb Fawker
04-03-2007, 10:57 PM
you should be able to fix it by droping the pan but first u have to figure wich solinoid is for ur reverse

godtool
04-04-2007, 07:50 AM
I'll start by dropping the pan if it's not due to low fluid level. If I cannot figure out which solenoid it is, I'll take a digital picture of it and post it and maybe someone can point me out to the right one.

Bdurig
04-04-2007, 09:16 AM
It's also a good possibility that your clutches are slipping, which is why you have to rev really high in order to move. And that would require to rebuild your tranny.

godtool
04-04-2007, 09:36 AM
How much to get it rebuilt, if I take it out?

I was thinking of replacing it with a th400? $$?

I guess the first step to save $$ for myself is to take it out myself, or do shops like to drive it first?

Anyone recommend a good afforable tranny mechanic or cheap good 400?

VAn Man
04-04-2007, 10:01 AM
I've heared the th300 is actually a better tranny than the 400 from a guy that used to rebuild em. Also they're a dime a dozen. A short shaft 2wd th300 can also be used on a 4x4 by cutting an inch off the output shaft. I did it on my 81 Jimmy. I used a th300 from a 78 camaro. worked perfect.

Kinslayer
04-04-2007, 10:34 AM
I have a TH350 for ya, it's in my truck right now but it's coming out. From your sig line you have the exact same truck as I do - tranny should work perfectly for ya.

My motor is coming out too, if you want/need other parts when/if you come down for the tranny there will be lots.

CITYSLICKER
04-04-2007, 11:16 AM
How much to get it rebuilt, if I take it out?

I was thinking of replacing it with a th400? $$?

I guess the first step to save $$ for myself is to take it out myself, or do shops like to drive it first?

Anyone recommend a good afforable tranny mechanic or cheap good 400?



pm ROBO on here he does the tranny rebuilds did a gooder job on mine 4L80E cheers and i think his shop has a fibc discount as well[cheers]

tenpack
04-04-2007, 11:18 AM
ive heard the thing about the th350 being better, i dont buy into it.

to rebuild a th400 with: new clutchs, bands, pump, torque converter, and shift kit is 1000 from quality transmissions.

godtool
04-04-2007, 12:24 PM
Kinslayer, does your tranny have the flywheel cover that fastens on with 8 bolts and has struts that go up to the motor mounts?

godtool
04-04-2007, 12:25 PM
If I rebuild my tranny whats the resale value of it?

Andrew Goll
04-05-2007, 10:01 PM
turbo 350's are lower geared and more efficient

Kinslayer
04-05-2007, 11:30 PM
If I rebuild my tranny whats the resale value of it?

If it was shiny i'd ask 200-300 by itself, at least, but that's a guess. I mean, the work to rebuilt an auto is..a lot I would expect.

Kinslayer, does your tranny have the flywheel cover that fastens on with 8 bolts and has struts that go up to the motor mounts?


Bellhousing? yup. Mine is still in the truck actually, it's got everything. I'll even hook you up with my CUSTOM body lift compatible column shifter linkage if you want, heh.

ottoman
04-06-2007, 12:10 AM
your tranny is dying

some guys like the t350 because it doesn't take as much power to make it work as the t400. the t400 has the lower 1st gear but if you want to run the t400 you will need the tcase to go with it wich is much harder to find

godtool
04-06-2007, 08:51 AM
th350 seems the way to go now. Had a th400\np203 that I already sold yrs ago when I had a 400 small block. Since I'm putting 4:10 diffs in, this takes load off the tranny so th350 is ok to still use.

So Kinslayer, I'm obsessed with the 6 bolts\2 struts holding the flywheel cover to the tranny bellhousing. This is important to keep the tranny housing from cracking when running big torque hp. Thats what I've been told. (1st question) So is it the 6 bolts cast cover or the thin tin cover held on with a few sheetmetal screws?

2nd question: Anyone just run the plain jane th350 with the tin cover instead of the bolt on cover with struts?

ottoman
04-06-2007, 07:56 PM
got no cover and t350 in a 1ton burb and no troubles with 40's and bigblock

Kinslayer
04-07-2007, 12:47 AM
th350 seems the way to go now. Had a th400\np203 that I already sold yrs ago when I had a 400 small block. Since I'm putting 4:10 diffs in, this takes load off the tranny so th350 is ok to still use.

So Kinslayer, I'm obsessed with the 6 bolts\2 struts holding the flywheel cover to the tranny bellhousing. This is important to keep the tranny housing from cracking when running big torque hp. Thats what I've been told. (1st question) So is it the 6 bolts cast cover or the thin tin cover held on with a few sheetmetal screws?

2nd question: Anyone just run the plain jane th350 with the tin cover instead of the bolt on cover with struts?


Hmm. I'm not too sure what you mean then. I'll take pics for you tomorrow.

godtool
04-07-2007, 09:48 AM
Thanks Kinslayer! I believe the 6 bolts 9/16" hex heads. 3 on either side, on bottom of flywheel inspection cover. Still interested regardless.