TCCoA Forums banner

1 - 14 of 14 Posts

·
Registered
Joined
·
17 Posts
Discussion Starter · #1 ·
Over the past couple weeks, have noticed a couple times that my 95 4.6 auto will rev-up a lot before shifting into 2nd gear. This happens at normal -not full throttle acceleration. RPM when this happens has hit at least 4000.

Tranny was rebuilt 11 months ago with shuddering problem. 85k on car, 15k on tranny since rebuild.

Anybody experienced this - know of the cause/solution?

Thanks,

chicabee
 

·
Registered
Joined
·
726 Posts
I had a similar problem. Wouldn't shift untill it hit the rev limiter, it was a broken 1-2 accum and spring.
 

·
Registered
Joined
·
855 Posts
i agree w/ greenbird........had a similar prob..........car wouldn't shift into third until i either a. eased up on the throttle b. waited a few second or c. had the car cool down.

every once in a while when the tranny got really hot the car would miss 3rd. it would rev up to the limiter and not go in,........until i hit a speed fast enough to go right to fourth.....if i dropped out of o/d manually it would buck the car and then eventually go in 2nd or 4th.

tranny did this for a while,.....then i decided to do the j-mod and found out it was already done on my tranny somehow,.......and when i filled it back up w/ tranny fluid that's when all hell broke loose,..........ended up needing a rebuild. burnt direct clutch bands (direct clutch turns on in the 2-3 shift)
 

·
Registered
Joined
·
3,902 Posts
I think my car is doing this too

Look at my symptoms:
Sometimes (usually at WOT or almost WOT) when its time for my car to hit 2nd, the RPMS do nothing but climb and it doesnt seem to go into second. I have to let off the gas for a couple of seconds and then I can finally accelerate properly. This is EXTREMELY embarassing and could hurt me if I was racing someone. Any ideas on what this is and how to check it out? Thanks
-Rob
 

·
Registered
Joined
·
295 Posts
The AOD-E in my 94 Mustang GT did that delayed-slam full-throttle shift into second gear when I bought it 2 years ago. "The Man" correctly predicted a broken lower 1-2 spring. J-modded it, all new springs, no delay anymore...
 

·
Registered
Joined
·
855 Posts
yeah, i would check to see if your 1-2 accum and spring are updated / still good. if not , do "The Mod" to the tranny and take it from there. too certain to say if you're tranny is fried, and in addition, it was "clutches" for me because my direct clutch was fried which is applied on the 2-3 shift. This isn't so for the 1-2, and since you aren't slipping off the line, i wouldn't think that the intermediate clutch is bad...at least not from what you say. Tranny been serviced recently?....at least drop the pan, switch to mercon V and while you're @ it, check the 1-2 accum or do the tranny mod.

EDIT: since it's a 94, you probably still have the older (unless someone changed them) accumulators in there,....so changing them out would be a worthwile upgrade anyways.
 

·
Registered
Joined
·
3,902 Posts
slam shift?

I dont know if I'm gettting a "slam" shift into second. There isn't really any slamming going on. My '94 tranny has been J modded for about 9 or 10 months and its been doing this thing for about 7 months or so. I left the bottom 1-2 spring out so it would hit 2nd harder. I get nice chirps out of it usually. It seems like its time for the car to shift, then it seems to shift out of first, go into second and then feels like the car is getting held back. It may make a "slam" noise...it only happens like once or twice a week so I'm not 100% sure. RPMs continue to climb while its doing this and the only way to get the car to accelerate properly after this is to let off the gas and let the rpms drop back down. Also, it seems to happen more often when I take off hard without completely stomping it to the floor, just almost there.
Were your symptoms like mine above? I want to get this fixed because next week im putting in 3.55s and am worried it will just compound the problem. Thanks
-Rob
 

·
Registered
Joined
·
3,902 Posts
j-mod

I've already done the J-mod. I drilled the separator plate with standard bits as close to the bits suggested. I replaced the 1-2 and 2-3 accumulators and at least one of the springs (sorry, been too long). Tranny cooler was installed and drained TC and replaced fluid with mercon V. Does this change suggestions? Thanks
-Rob
 

·
Registered
Joined
·
295 Posts
My Mustang was a 100% unmolested 40,000 mile GT. Middle-aged mom version. Don't flame me please, but I think I could tell by the tire wear (original Eagle GT+4's) and Big-Honkin'-Mommy-key-chain scratches that it wasn't driven by an enthusiast... None of the common mods done (K&N, exhaust, pullies) and a slew of oil change receipts. Who else would want a lipstick red, 2.73 rear-axled automatic besides my 50-year-old mom?

Anyway, the 1-2 shift was really hard, not chirp-level, but hard, with a distinct pause between the gears. I e-mailed the man, and he told me it was due to a "class problem" broken lower 1-2 spring. When I pulled it apart for the mod, it proved he was 100% correct. Now, after doing the <300HP version (all 3 springs), the 1-2 is just as firm, but with no delay anymore. Maybe slam isn't the correct word now, but stock it was very jerky due to the delay. No particular sound involved. I don't expect it to chirp the tires, with a stock 5-point-slow and the 2.73 rear gears.
 

·
Registered
Joined
·
855 Posts
Re: slam shift?

Rob said:
IAlso, it seems to happen more often when I take off hard without completely stomping it to the floor, just almost there.
That's exactly how mine was. The symptoms that you're experiencing are 100% the same as mine only instead of the 2-3 that i initially had a delay in, you have one on the 1-2. Might be the clutches. If you take off @ WOT the car sometimes shifts fine....if you take off slow it's fine, but somewhere between moderate and not quite WOT, there's a delay where it goes RVVVVVVVV.....VVVVV....VVVVVVV.... |*lets go of gas*| .... SHIFT. Mine did it on the 2-3 then slowly migrated to the 1-2 and all gears, 'till one day i went to take off and the car didn't move anywhere, just revved. Then it would go RVVVVVV-SLAM-SCREEEECH. Did this every once in a while 'till eventually it happend all the time, and by then i had the cash to rebuild the sucker.
 

·
Registered
Joined
·
3,902 Posts
awesome

Since we have the same symptoms, what do you suggest I do or look for?You said it was intermediate 2-3 clutches. Do you think its the intermediate 1-2 clutches on mine or something else? I'm not going to hold you to it, I'd just like to know what other people did so I can make things a little easier on myself. Thanks!
-Rob
 

·
Registered
Joined
·
855 Posts
well mine was shifting weird on the 2-3 shift @ first before all the mayhem happend. on the 2-3 shift, the direct clutch is applied and mine were pretty fried. However, i believe that my intermediate one-way clutch also was dying in addition to the sun gear which had to be replaced. I didn't do the work myself, but i saw the parts as they came out...didn't look cool. You might want to check out the trans article:

http://www.tccoa.com/articles/tranny/transmission/page3.shtml

That explains what happens at the different gear changes and may help you out a little more , for i'm no tranny guru. Just letting you know what my past experience was which eventually required a rebuild (i drove it like that for about a year before i found out what the heck it finally was. thought it was the mlps, maf, tps, wires, ... car had a bunch of other things that had to be changed before we narrowed it down to just the tranny)
 

·
AED Specialist
Joined
·
1,283 Posts
First...

chicabee,

I would check the fluid level and condition, then drop the pan and filter and remove the 1-2 accumulator piston. Check to see if the spring has broken. If your '95 has the new style accumulators pistons and updated springs, then it could be the intermediate one-way roller clutch is distressed. You mentioned it was rebuilt and only a fool would install another intermediate one-way roller clutch (OWC). I would hope you have the newer mechanical diode intermediate one-way clutch (MD OWC).

If they did install an older type OWC, and the true center line of the case is off when compared to the stator support, you will fail ever OWC they put in.

This is the part you need.

A-Train

 
1 - 14 of 14 Posts
Top