Long shift to third .

cohammer60

cohammer60

Senior Member
Looks like my transmission is on the way out . Shifts from first to second at about 18 mph and into 3rd about 24. Some times it long shifts into third. I changed the filter screen and made sure fluid level is perfect at hot idle . Is there really any kind of mystery oil that really helps ? Or any other suggestions for my 1974 bronco with C4 automatic.
 
One suggestion; check for vacuum leaks in the line going to the vacuum modulator or possibly the Vac Mod is bad itself. Cheaper to check that a new trans.

Check band adjustment?

No mystery oil... :rolleyes:
 
Lubegard friction modifier is a great product and the only one I recommend. I use it in all of my rebuilds. If this stuff doesn't improve the shift quality, you're going to have to rebuild it. You have to use the stuff in the black bottle in a silver and black box. It's about $19.00 in parts stores and available on e-bay for less than that.

LUBEGARD Highly Friction Modified ATF Transmission Additive Fluid BLACK 61910
 
Thanks for that information . I will check the vac module and hoses , I changed all the rest of the hoses and they were rotten , then the lube guard sounds good.
 
I had that happen to me twice, a C-4 on a Mustang and a C-6 on an F150. I put a quart of Trans X additive in the Mustang ( the additive was new on the market in 1988 when this happened) It cured the problem for about 6 months and by then I was ready to have it rebuilt. Did the same for the F150.
 
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