The Ford Barn

cohammer60 · 05-10-2015, 05:41 PM

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.

Y-Blockhead · 05-10-2015, 05:51 PM

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...

Motorhead6 · 05-10-2015, 05:55 PM

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

cohammer60 · 05-10-2015, 08:16 PM

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.

Alaska Jim · 05-10-2015, 09:34 PM

can't remember if the bands are adjustable on this trans., if so try and adj. them. It may help.

Y-Blockhead · 05-11-2015, 06:59 PM

Sponsored Links (Register now to hide all advertisements)

Yes bands are adjustable on a C4... I mentioned that in my post above.

Alaska Jim · 05-11-2015, 11:01 PM

Sorry, must have not completely read the post. I always value your knowledge.

Y-Blockhead · 05-15-2015, 11:04 PM

Quote:

Originally Posted by Alaska Jim

Sorry, must have not completely read the post. I always value your knowledge.

Just shows great minds think alike...

hoss73ford · 05-20-2015, 03:07 PM

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.

a4278v · 05-21-2015, 03:05 PM

make sure your throttle kick down linkage is on and functioning correctly

05-10-2015, 05:41 PM	#1
cohammer60 Senior Member Join Date: Nov 2011 Location: Silver Creek GA Posts: 100	Long shift to third . 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.

05-10-2015, 05:51 PM	#2
Y-Blockhead Senior Member Join Date: Jul 2011 Location: Redondo Beach, CA Posts: 5,849	Re: Long shift to third . 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...

05-10-2015, 05:55 PM	#3
Motorhead6 Senior Member Join Date: Jul 2012 Location: Orange Park, Fl Posts: 406	Re: Long shift to third . 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

05-10-2015, 08:16 PM	#4
cohammer60 Senior Member Join Date: Nov 2011 Location: Silver Creek GA Posts: 100	Re: Long shift to third . 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.

05-10-2015, 09:34 PM	#5
Alaska Jim Senior Member Join Date: May 2010 Location: Palmer, Alaska Posts: 1,575	Re: Long shift to third . can't remember if the bands are adjustable on this trans., if so try and adj. them. It may help.

05-11-2015, 06:59 PM	#6
Y-Blockhead Senior Member Join Date: Jul 2011 Location: Redondo Beach, CA Posts: 5,849	Re: Long shift to third . Sponsored Links (Register now to hide all advertisements) Yes bands are adjustable on a C4... I mentioned that in my post above.

05-11-2015, 11:01 PM	#7
Alaska Jim Senior Member Join Date: May 2010 Location: Palmer, Alaska Posts: 1,575	Re: Long shift to third . Sorry, must have not completely read the post. I always value your knowledge.

05-20-2015, 03:07 PM	#9
hoss73ford Senior Member Join Date: Jul 2010 Posts: 142	Re: Long shift to third . 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.

05-21-2015, 03:05 PM	#10
a4278v Senior Member Join Date: Mar 2015 Location: NJ Posts: 251	Re: Long shift to third . make sure your throttle kick down linkage is on and functioning correctly