POS 3650(Help)

[Loner]

I have ran into trans promblems just a little bit of grinding powershifting to second complete lockout shifting to third just started this **** about a month ago so i changed trans fluid to RP Synchromax and installed Steeda firewall adjuster,clutch cable, and quadrant tried it out today and guess what same promblems not a bit of improvement my guess is bad synchros my question is would i be better off to fix the 3650 or just switch to a completely different trans and if i made the switch what would yall recommend also if i swapped to a six speed what all parts would i need

[Machy uno]

how many miles, are you the first owner...? Need more info....

The 3650 isn't by any means the best tranny out there, but they're not as bad as some people make them out to be. For most applications in the mustang they'll suit perfect. They can handle as much power as the stock engine and if you drive it well then the tranny will last. It has problems with people who aren't great drivers and put extra stress on them. I prefer the 5 speed over the 6 speed personally....

Based on what you've described I would say it's the syncros....not the cheapest fix, but much cheaper then a whole new tranny. My recomendation would be to get them fixed rather then go with the 6 speed IF the car has a decent number of miles on it (I'd say 60k+). This is a regular problem around 75-100k miles anyway from what I've seen on a hard driven mach. Plus, the rest should hold up fine for a good deal of time. If you have significantly less miles there may be a more serious problem now or in the near future.....then its time to consider other options. It could be a previous owner wasn't a good standard driver (or perhaps yourself... ) and has caused some damage to creap up before its normal time....

[Machy uno]

Originally Posted by Mach1Marauder

Synchromax isn't for these transmissions.

I didn't even catch that....

If I remember correctly they use ATF....

[Loner]

Synchromax is for manual trans that require ATF car has 51k on it i beleive im the second owner had if for a little over a year promblems just started bout a month ago from what i read i figured the adjuster,clutch cable, and quadrant would have fixed it but unfortunately it didnt

[rygi23]

Had mine rebuilt at 35K. 3650 is descent will bust eventually with alot of abuse. Changing 2nd and 3rd syncros is expensive. If you're going to keep powershifting switch to a TKO or T56. Have a shop price out a rebuild for you then weigh you options.

[MachMeHard]

raise where the clutch pedal engages the clutch and try again

[Loner]

Well maybe the 3650 isnt so bad after all raised where the clutch pedal engaged now my mach back to shifting correctly thanks for the help took a few times had to be real close to the top.

[01snake]

ya.....

i had a spec stg 2. clutch with only 310rwhp. went to powershift into 3rd and blew the clutch to pieces and now have tranny fluid all over my garage floor

im not fixin the POS im swappin in a built C4

[006]

Mercon Dexron III

This is the fluid you need in your transmission.

Ford screwed up by putting synthetics in half the TR3650 transmissions and here is the TSB to fix their ****up:

http://www.stangnet.com/images/stori...s/04-15-06.pdf

BTW, the replacement fluid mentioned in the TSB is Mercon Dexron III

Synthetic causes the grind because the synchros cannot slow fast enough due to how slick the synthetic is.

[PharmDMach1]

I just went to a Promotion built 3650, feels smooth like butter and built to handle some abuse.