[maxoverclock]

Just put a few miles on my T-5 conversion. Question for those with a T-5. I shifts fine except for 5th. When I try to shift into 5th the gears grind. In order to get it into 5th I have to let the engine RPM drop down to below 2000rpm. Any ideas. Thanks in advance.

Max

 

[maxoverclock]

I assume the T-5 is used if you are experiencing this problem because it is a VERY common problem with high mileage T-5s. Your 5th gear synchronizer needs replacing. I would just rebuild the tranny if you have to get that deep in it.

no its new, fresh out of the box

 

[maxoverclock]

What kind of fluid are you using in the T5? The T5 can be prone to shifting problems when using synthetic ATF. The 5th gear and reverse gear are on the same cluster shaft. The shaft is supported in the rear by the case of the trans. Over time, the rear mounting hole can become elongated (oval) allowing the shaft to no longer be straight, which can be a problem when shifting. GForce sells a support for the 5th/reverse shaft, which looks like a thick steel washer. If you have to rebuilt the trans, consider adding in this part as preventive (or actual) maintenance.

good luck.

I filled it with mobile one synthetic ATF. The transmission has 80 miles on it since received it from JMC. Going to call them tomorrow and speak with them.

Do I have to do anything special to switch from ATF to dextron III. If the tranny is new is this switch worth trying, or should this problem be here in the first place?

Brian

 

[maxoverclock]

sees like it will pretty inconvenient and distracting on track days. is this how it suppose to be or is it defective. my warranty runs out this coming week, wondering if it is worth the trouble to try to get a warranty replacement.

max

 

[maxoverclock]

Not to worry. I bought a new T5z and it does the same thing. No synchros for reverse and I believe 5th too. Have to shift into some other gear before shifting into reverse and I have to wait a second or two before shifting into 5th.

That doesn't seem normal for a new transmission to have shifing problems into any gear. It doesn't make sense for the engineers to design a transmission that has known shifting problems when it's fresh from the factory.

Just got back from a drive. Had my pop take a vid when I was accerating through the gears. This is not WOT. Secondaries are not opening. Turn the volume up and you will hear...

Note this is a 30mb file so it will take minute to download.....

https://myfiles.neu.edu/b.weinberg/public/P1010722.MOV

what do ya'll think. it just ain't right as far as I am concerned.

max

 

[maxoverclock]

I am using a hydraulic throwout bearing. I get full disengagement halfway through my pedal travel so I know my clutch is completely disengaged.

 

[maxoverclock]

If it's any consolation, the engine sounds very good. The video should be pretty good evidence for the transmission builder.

Thanks, you should hear it in person at WOT. Gotta love the Borla mufflers + x-pipes...

 

[maxoverclock]

Can you sjift into 5th at idle without issues ?

Sure the small plastic bushing inside the shifter is good ? (goes into the shift rail , ball from shifter slips inside it) .

Another check , stick it in reverse and wait a second . While you keep the clutch pedal down , pull it back out of reverse and see if it gives much of any trouble going back in . If it starts grinding away going back in , either the clutch is not releasing correctly or the pilot bearing in the back of the crank is grabbing the input shaft and spinning it . It might chunk-grind into gear but should not give a grrrrrr grind .

The clutch could appear to be releasing but if the input shaft bearing retainer is worn the throw out bearing will ride sideways and not correctly disengage the clutch . On older clutches you would get a hard chatter (3 finger) but newer diaphragm pressure plates kinda prevent the chatter . There is also the chance of alot of grease slinging from the pilot bearing (or oil from tranny or engine) and onto the clutch disc .

One more option is the disc sticking to the input shaft splines due to worn splines or lack of lube (doubt this is the problem) .

I'll have to check out when it is idle. all the other parts are new.

 

[maxoverclock]

good news, i called tremec today. they were really nice. i emailed them over the weekend and they said that they have no problem replacing the transmission. they will ship me a new one after i email them the tag number. very cool.

 

[maxoverclock]

sees like it will pretty inconvenient and distracting on track days. is this how it suppose to be or is it defective. my warranty runs out this coming week, wondering if it is worth the trouble to try to get a warranty replacement.

max

I had several folks including some on this site tell me 2 years ago that reverse is not synchro'd. The reason I said that I believe 5th is not synchro'd is that I could not remember the details behind that issue. If you use 5th gear at the track, you have got one long track or you have such low gears in the rear that 1st gear has become very short and almost useless. I have never used 5th gear at any track and only on the freeway. If there really is an issue with 5th grinding I would still be interested to hear about it. I use synthetic oil.

Call Modern Driveline and they will be able to tell you immediately if you have an issue with your T5z.

Have 3.89 rear end gears. At 110mph, I'll turn lots of RPM in 4th gear, almost 5900. Not to comfortable with that until I rebuild with forged internals. Think I'll have to use 5th on the straights or risk engine death.

Tremec said my transmission is defective. He said I should have my replacement by Monday. The will sent a call tag to pickup the old one after I do the swap, hopefully in a few weeks....

max