marcus219

1986 GXL...new CM clutch, pp, t-bearing, p-bearing, shifter busings...shifting into 2nd and 3rd fast/hard results in grinding. 1st gear...doing say 5-10 mph and then push clutch in, here a brief grind from tranny. 2nd gear pulling to like 5k tranny makes a grind/whir noise. Transmission going to crap....i know the 2nd 3rd syncrhose must be crap. And almost always, when going into reverse, it will give a little grind. Also...today at stop light..i reved it to 1500 because i was listening for a sound i thought my motor was making, but turned out to be another car...and i pused in clutch and put in gear when revs were dropping for 1500...grind...that cant be normal...it shouldnt matter if you were at 6k and put clutch in and tried going into 1st or would?

Last...good idea to try and get my trans rebuit, or find a j-yarder......miata gears w/rebuild?

GlenL

If you rev'd to 6k w/o pushing in the clutch, then pushed down clutch, and put it into gear, it would grind if you had suckass synchros.

Icemark

I'd be checking the clutch master and slave, as well as using some redline MT90 in the tranny first before I started shopping for a new one.

marcus219

thanks for the fluid reccomendation...ill try that.....as the clutch master and slave.....they seem to be working properly....i pull the cap off and pushed clutch in and out slowly and didnt see any wierd fluid bubbles....bled it too....im running just 85w-90 gear oil now....where the hell can you get redline mt90 locally....shucks doenst have sit for trans fluid. I was alost told a little atf might help in there too. Thats what they run in alot of the manual (yes i said manual) trans's in new cars.

dr0x

Redline mt90 is the only thing I would recommend. They also make some stuff with lsd additive, guess where that goes?

marcus219

ummm...in the motor oil.......it all makes sense now...


what are the chances of fluid fixing those problems?

HeffBoost

Fix, no, help, yes. Red Line really helped my grinding. If I'm going hard enough I still get some clash going into second.

I'm kinda wondering how long it's supposed to last though. It was an amazing difference when I first put it in, Nov 01 or about 12k mi. ago, but at this point it seems to be deteriorating a little bit. It grinds just a tad easier than it did at first.

Cheers

Icemark

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Mr. Eccentric

Bad synchros, usually 1st to 2nd is the first to go in a sportscar.

Matlock

Hey Marc! There is a shop in Fedral Way that carries Redline products. I searched all over this town for that stuff. Nice shop! Anyways, the fluid did nothing for my trans, in fact after a few months I switched back to a standard 80w-90 (actually helped more). It's certainly worth a try though. It is a little pricey. I'll talk to you later.

HeffBoost

That's the first I've heard. Did you have synchro trouble?

deltr0n`

dont wait too long or else your tranny is going to go to ****, like mine just did about an hour ago...i can only use 1st and 2nd now....

Rx-7Blazin

my tranny is grinding in 3rd and only in 3rd it will do it usualy if the rpms are high and almost all the time during downshiftin unless i let the clutch in and let the rpms go way dow what the hell is going on???

silverrotor

iTrader: (1)

Have you considered using Redline's Shockproof? It's a new Oil offered through Redline that Is more superior than MT-90. You shift gears like It was done effortlessly.

Rx-7Blazin

it says its for shifter carts/motorcycles's are you sure you can use it in a manual rx-7 daily driver if so what weight and how much

silverrotor

iTrader: (1)

Weight? I'm not sure. 2.5 quarts should suffice. My mechanic and I were discussing this at one point and I went for It. I'll look Into the weight and reply back.

Rx-7Blazin

thanks mabe it could fix my problem

silverrotor

iTrader: (1)

I, amoung others, would place Redline's MT 90 up there. But b'c Shockproof Is fairly new and It's properties are more advanced, my Mechanic holds this Oil In high regard and with my personal use I can lay claim that It did Improve my shifting to be more faster and the Oil didn't take as long to heat up allowing "notch free" shifting as compared to MT 90.

marcus219

If my synchros are already going bad..I'm thinking the cost the the synthetic fluid wouldn't be worth it..don't think that its going to make my synchros "un-worn".

Still probably gonna try it though..

Rx-7Blazin

oh yea another thing my shifter does this sort of thing

1_1/
1 1 \ see what im saying it should be like this

1_1_1
1 1 1
anyone know what that could be????
it shifts straght up in 1st straght down in 2nd straght up in 3rd straght down in 4th the at an angle upwards in 5th and at an angle in rev.???? its really weard ive never seen a shifter do this and thats all ive ever owned in manuals???

Jeseth Cloak

My RX-7 shifts the same way. It's normal as far as I know.

Rx-7Blazin

um??? i dont know about that mabe your missunderstanding me but you have to push it way out at a like 45deg angel in 5th ans rev