I did search the boards but didn't find the situation that led to no drive or reverse.

I drove my '88 IROC (TH 700R4) down the road and shortly after, while my foot on the gas (part throttle) the engine suddenly revved much higher. I immediately pulled over and looked under my car.

Driveshaft was still there, didn't fall off.

No transmission fluid leaks.

Engine still ran fine.

Checked fluid level (was in the cross hatched area since engine was still not fully warmed) and the fluid didn't smell burnt, was still red (not dark), no metal specks came out either.

Got back in car and shifted the gears and found no Drive or Reverse. I did hear the gears (Drive or Reverse) engaging, but when I applied the throttle, the car only moved a couple of inches and no more.

I read that the TV cable could have been out of adjustment. I readjusted the TV cable but still no Drive or Reverse.

My IROC is all stock. I changed the ATF once and sometimes twice a year to keep this GM automatic alive. Apparently it has worked and finally, this 16 yeard old TH 700R4 finally gave up.

And this trans has NEVER leaked ATF (not even the front seal) and never been rebuilt or reprogammed with a "shift kit." To me, this is unbelievable for a GM automatic. My other GM rear drive cars '78 Cutlass (TH350) and my '76 Monte Carlo (TH350) leak ATF. All my relatives with rear drive GM auto cars all leaked at one time or had to have their transmissions rebuilt.

What do you think?

 

Ive got a 94 buick regal with a 4T60E that wont go anywhere until the car has been running for 30 minutes and the fluids are all warmed up. Then it will shift into gear with a clunk and jerk and then go. Before its warm you can shift into any gear and rev all you want and it wont go anywhere. I dont think your problem is the same since it happened when you were driving. All I can think of is maybe the pump is gone and you dont have enough pressure to get the car going. Dont know how hard it is to replace the pump maybe some of the other guys can offer some advice.

Wesdog

 

No one had this happen to them or knew someone else in this situation?

 

Yeap it just happened to me the other week. I'm at peace with the thought that my transmission went out. No forward or reverse.... same thing. Go out and get another one, bud.

 

Yeah it's dead. Rebuild or replace.

 

I didn't drop the pan on the trans yet, but could the plastic atf filter tube that goes up into the trans be cracked? Possibly causing no fluid reaching the oil pump?

 

could be, sounds like you broke the sunshell or lost the pump.

 

I pulled the trans pan and found no burnt atf, normal amount of metal shavings (very little), no chunks of metal in there, oil filter pickup tube was fine and not clogged.

Put new atf and filter in. Shifted the gears and the car now moves a lot more than it did the day it broke down. It still won't drive or reverse like normal, though.

So, it's time to take it to a shop or find a decent used 700r4.

 

Awwww man. I just found this thread. Sorry bout your trans man! I would help you out with dropping the trans but I can't, being that Carrie & I have a daughter now, it's harder to do things. (Don't know if I told you that we had a kid) Hope you get it fixed soon!

Anthony

 

Yeah, it went out a week and a half ago. You got a spare transmission at your house?

I checked out a used GM rebuilt 700r4 from a 91-92 Z28. Pulled the dipstick and the fluid smelled burnt, was dark brown in color, and siting in for a year. Probably had lots of miles on that rebuild. I'm not willing to take a chance on that by installing it only to have to pull it out again and do it all over again.

So, maybe time to take it to a trans shop. Kinda steep for me to drop like $1300+. I could rebuild it myself, but requires lots of special tools and time.

 

Did you check the governor gear? Was it apple cored or the gear cog gone?

Jim.

 

I didn't take the transmission apart. I do have a TH700R4 manual with an exploded view of all the internal parts.

What is the governor gear and where is it? Is it the "sun" gear? Planetaries? Carrier? A valve body part?

 

Same EXACT thing happened to me a few weeks ago. I gave up on the idea of a rebuild as I have had horrible luck in the past with other cars. I am going to go with a new unit, haven't decided from who yet though. Anyone suggest a brand? Best of luck man!

Will

 

Under the round cover on the left side just in front of the tailhousing. I don't know that it would be causing your problem though.

 

Located on the right side of the trans behind a small dome.

 

I had my IROC with TH700R4 towed to a trans shop today. I made sure the engine ran before the tow man came. Engine ran fine. The tow man arrives and we had to push it out of the garage. I figured run the engine to make steering the car easier. BUT the car wouldn't start!!

No noise fro the starter, not even a "click," the engine won't even turn over. The fuel pump still works since I could hear it. I had the car sent to the shop anyway. Now what could be the problem? Dead battery? Starter (original 16 years old)solenoid went bad? Neutral safety switch? What else can go wrong?

 

What trans shop did you take it to? Is it at ******? Also, it could be the starter that went bad. Don't you hate it when things start to all go at once. Don't feel too bad though, cause those kinds of things have always happened to me! If it also makes you feel better, Carrie's Camaro is dead! It died on me around my house while test driving it with the new suspension. Hope your trans & starting problems get fixed though. Good luck.

 

I took it to Kiyo's on Queen Street. They did my '78 Cutlass 10 years ago and used a Trans-Go shift kit. The Cutlass drove, performed, and shifted way better after the rebuild on the TH350.

I'll go check out my car today after work. I hope they've started by taking the trans out.