please help

waisone · Sep 27, 2010

i dont know if you guys remember i posted here awhile back asking for transmission help, after that i got a guy to look at my 1988 bronco2 its an automatic and is 2 wheel drive. anyways seems the transmission is working fine because it goes in gear and spins the drive shaft but the truck wont move on its own, even when in park you can literally just push the bronco. i was told to replace this part which i believe is the drive shaft i posted a pic. im searching for drive shafts and they look different, it spins when in gear and says were going 15mph but its not interlocking with the differential to move the back tires. does this seem like the right part to replace? hopefully some one here can help me out thanks!

adsm08 · Sep 27, 2010

Well, that is the shaft, and there are several styles. When it spins, does the end bolted to the rear axle spin too?

If it doesn't then you blew up a CV-joint. If it does, you blew up the diff.

bonedoc · Sep 27, 2010

Yeah...that would be my question. If the driveshaft spins all the way through and is turning the flange where it mounts on the axle then it is doing its job. The problem would then lie in the differential itself. Do you here any grinding, clicking or any sounds from the rear when you try to move it?

Nathan123 · Sep 27, 2010

Could the axle shaft splines be stripped?

adsm08 · Sep 27, 2010

Nathan123 said:
Could the axle shaft splines be stripped?

Far more likely that he cracked a spider.

I'd also seen an 8.8 from an 83 F-100 with 5" of teeth stripped off the ring after a clutch dump.

Shran · Sep 28, 2010

Pull your diff cover and see what is going on in there. Probably blown up spider gears, from the sound of it. If that driveline was bad it would make a lot of noise when it spins.

Spider gears are really easy to replace if that ends up being the problem.

waisone · Sep 28, 2010

sorry for the late response guys. anyways if you see the pic the part on top of the step thats the side that plugs to the differential. the shaft just spins within that side and you hear it grinding......i might of found one already at a local junk yard im going afterwork to check it out.

BlackBII · Sep 28, 2010

It sounds like your differential is Ok, it's just the shaft that is busted. They use a CV joint and they are not reliable.

Go to a junkyard and find a new one. Preferably one with U Joints.

adsm08 said:
I'd also seen an 8.8 from an 83 F-100 with 5" of teeth stripped off the ring after a clutch dump.

......How about the pinion?

This is from the Dana 35 in my BII. :icon_thumby:

waisone · Sep 28, 2010

BlackBII said:
It sounds like your differential is Ok, it's just the shaft that is busted. They use a CV joint and they are not reliable.

Go to a junkyard and find a new one. Preferably one with U Joints.

......How about the pinion?

This is from the Dana 35 in my BII.

yea hopefully that solves my problem an i can get that monster on the road again. itll still need work but this would be a huge step.

also dang that piece looks messed up

xr75er · Sep 29, 2010

waisone said:
yea hopefully that solves my problem an i can get that monster on the road again. itll still need work but this would be a huge step.
how did you get a picture of my pinion from the 1963 f-100 I use to have lol

please help

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