FireDemonSiC

I have a 700R4 Transmission in my car that began acting very erratic this morning.

I noticed that when I was hitting the onramp for the freeway, the engine RPM's went abnormally high (4000 RPM+) with little or no acceleration. I'm still not sure whether it went into 4th (I couldn't have been going more than 40MPH) or slipped into Neutral. On the way to work everything seemed fine.

Break time rolls around and I decide to shoot home for a second. on the way home, I noticed that the tranny would get "stuck" in the upper gears, in other words it did want to downshift. Driving around for a bit and playing with it, I noticed that it would:



A) Not downshift on It's own except every once in a blue moon, but on the way home it will not downshift on It's own at all now. It gets stuck in 3rd or 4th, whichever gear you were last driving in. Ever try pulling away from a stop light with a manual in 5th gear? yeah, it felt like that. You can stand on it and the car revs away but barely puts along.

B) Upshift fine, but late. Most of the time between 4000 and 4500 RPM at just part throttle.

C) Shifts perfectly fine up and down if manually shifting with the B&M ratchet, but still late on the upshift.




So, in a nutshell my transmission still "shifts" fine, but upshifsts late and will not downshift on It's own. You have to use the shifter to move down through the gears, almost like my transmission has magically installed a full manual valve body in itself.

The previous owner claimed to have both rebuilt the tranny and installed a B&M shift kit before he sold it to me. Now I can tell the shift kit part was true from the 1-2 snap, but the rebuild I have no way of verifying short of tearing the tranny apart.


Is this something simple, or is time to visit bowtie overdrives?

ed o

bto is in my area, and I build also pm me if you're local sac and I could help also. They have a pretty good rep around here but think they are a pretty good source for a fix.
When you manually shift it you are using additional parts in the trans to complete the shifts, so it isn't so cut and dry as to what the problem is. the late shifts while in drive(automatic) would indicate either something slipping and not able to complete the shift, or something stuck, or similar. when manually shifting the overrun clutch is helping pull the transmission down the road in first, second, and third so the trans is less sensitive to other clutch problems like burnt forward clutches(on in all four gears), burnt band(on in second and fourth), and burnt 3-4 clutches(on in third and fourth).
You could easily check the t.v. cable adjustment, governor for apple core(plastic teeth wear in the middle of the gear), governor valve stuck, or t.v. valve stuck(not to be mistaken for the plunger) in the valvebody. the t.v. stuck thing is the hardest to check as it requires removing the valvebody

FireDemonSiC

Great.

I just finished replacing the engine. I can't afford to replace the transmission...


Say I continue driving like this. How much longer do I have before I end up having to call a tow truck?

FireDemonSiC

Great.

I just finished putting in a new engine. I can't afford a new transmission.

If I keep driving like this how much longer do I have before I end up calling a tow truck?

50 miles? 100 miles? Sometime before the next oil change? A few months so I can save up for a new tranny in the meantime?

deoverton

I'd say probably not much longer... When I had my 86Z I had something very similar happen. From a start it wouldn't **** till about 4-5 grand and bark the tires. I think I drove it about a month before I heard a final pop and tranny fluid went everywhere and it coasted to a stop and that was the end of that. Start hitting up craigslist and see if you can find a used one for cheap that would hopefully last till you can save enough for another transmission.

ed o

I didn't say i'd charge you for a trans. I said i'd help you out. pm me any time for additional info on this trans and I'll be glad to help. I do a lot of them all the time and if you're in the area I could even help with parts as I have a lot hangin out no charge just too good to be true I know....

FireDemonSiC

I never meant to imply that YOU were trying to charge me for a trans.

And as for the helping out part, problem is your in CA and I'm in VA. We've got a whole country between us

Thanks for the offer though.

I H8 WWD

iTrader: (5)

Mine does this as well, well not completely.

No matter what I have to wait until 3500-4500rpm to shift gears (manually or automatically) like deovertron said his did. Downshifting was perfectly fine, no problem whatsoever...but for its life it WILL NOT shift until after high rpm. Because I dont want to see any further problems, I am replacing mine with a BTO Stage 1. Should give me at least a few years out of it, as I will take care of this trans. Royal Purple Baby, and I dont drive that much.

Let me know what you do, might buy my trans sometime in july...already started saving...haha.

FireDemonSiC

Just to let everyone know, the tranny finally went to that big junkyard in the sky yesterday. Coincidentally I was heading to AAMCO to have ti looked it at.

It made it exactly 1.1 miles up the road. It didn't shift into 2nd until 5000RPM. Then I thought, "OK good now I can just baby it to AAMCO if I can get it into third. at about 3500, it tried to shift into 3rd (A gear that previously had no issues), there was a thud I hadn't felt since I bought the car with a busted tranny mount, and the engine just revved up like it was in neutral. I had to coast it into a gas station and call for a tow.

P, N, and R all work but I have no forward gears now. In think I drove it maybe a total of 20 miles since I first made this post.

I H8 WWD

iTrader: (5)

See, thats what mine does, no matter what will not shift until high RPM. I dont want to blow it so Im just buying a new trans. Ill treat this one with respect. Sorry to hear too, so whats going to happen now? Is it at home or at the shop?

FireDemonSiC

Shes resting at home.

Won't be able to drive fow awhile now. At least reverse still works, so when spring hits I can back out and coast a few spaces up to wash off the winter mess.

But yeah. I'm gonna buy a beater car and as for the 5.0 just do a piece here and piece there. I'm gonna buy new weatherstripping on the 10th as a parting gift before I cover her up for the spring. Won't operable until summer.

Yesterday I had to push it into It's parking space, get out the cover and call the insurance company and drop my coverage to liability only so yeah, sad day .

I H8 WWD

iTrader: (5)

That does suck though. This happened to me (insurance related) where I bought insurance for my Z31 (6 months due to not driving it in the winter). Well about 1 month goes by and BOOM, blew the water pump, and for those who dont know, on a VG30 motor when you replace the water pump you should also do everything else as well...on a SBC no problem, but a VG30 nissan motor....that means timing belt, sprockets, seals and a bunch of other crap....THEN you can change the water pump. Came to about $400 in parts and a good 2-3 day job...since I have never removed a crank sprocket and reinstalled one...which is the hardest to do since you have to drill the sprocket then tap then use a pulley puller to remove....I said F That and am trying to sell the car with all its parts. I have about $2500 into the Z31 with all parts having under 200 miles on them and selling for $750 firm...just to much work for a V6. Sad part is I had 5 months insurance on a car i couldnt drive and more $$$ into it that my camaro....which was NEVER supposed to happen. but yeah, that was a sad few months for me, now Im back on the camaro ready to go.

I think I will be buying a new trans from Bowtie as they are cheap and I dont have enough power to matter for a built 700R4 from Pro-Built. But then I'd rather just buy a T-56 for the $3500 it would be from Pro-Built for the trans I want because I'd rather have a stick. But we'll see.

dippo6

most likely reaction sun shell gear, it shears off.. when it does u loose 2nd 4th and reverse, reverse was wierd when i did it though.. worked a little and didnt work a little.. huge problem with these trans's

FireDemonSiC

Actually, the trans let go awhile back. I lost all 4 forward gears but reverse still works