65 3 on the tree with over drive ?'s

[jcramsey]

Originally Posted by frankslagoon

Yes its a R10 the R11s r hard to find they have 4 gear pinion gear ass. instead of 3. You have drill a hole in the 4 speed case for the reverse lock out rod to come thru. ya can,t shift into reverse while in overdrive or you'll kill the engine. the o/d trannys have a bump on the reverse shifter inside the tranny that pushes a rod back into the o/d and shifts out of o/d when ya shift into reverse. But I'm thinkin the cases might be the same and ya could actually use the 3 speed case. maybe,

Thanks frank. I've got a 3 speed OD on my bench now. Any tips for marking and drilling the hole in the 4 speed case? Or is it as simple as just bolting them together and slide a tight fitting punch in the hole?

[frankslagoon]

You can set the sun gear control plate, the one inch thick spacer between the main case and rear tail housing, on the case and I just hole punched it. good enough. but the better job you do the easier the rod will slide . Somewhere on the site here is a thread to the Hot Rod Mag. article from way back that walks ya through it. the trick is making the 4 speed reverse shifter push the rod back. first question? are you using a Saginaw 3 sp. like in the pic I posted with the 2 trannys on the table?

[jcramsey]

I've got a muncie 3 speed with OD...no saginaws. No plans to do the 4 speed conversion in near future, just curious what all was involved. Thanks for your help!

[frankslagoon]

ok

[jtrichard]

Originally Posted by frankslagoon

That's what I did . I ran a wire from fuse blk. that comes on when I turn the key on. then up to a switch on my shifter. then down to the sol. the switch is a 30 amp push -pull and so far it's hangen in there?? but my problem is the relay. All the old relays look like a 3 prong relay.I think the power should go from the batt. or ign. to the relay and thru the relay to the sol. the gov. must finish the circuit by grounding the relay ? is that right. ?

This should help you it shows the original wiring and a newer home made version
http://www.classictruckshop.com/club...over/drive.htm

[frankslagoon]

Ive seen all that stuff just need the right relay. The gov does it complete the ground circiut at the relay

[frankslagoon]

Originally Posted by SOUTHERN917

Well I do have the Unicorn hidden under my truck!!! It is a 319 Muncie out of a mid 50's Studebaker or Biscayne. This is the shop manual I used, and I'll try to post pics ASAP!!

http://chevy.oldcarmanualproject.com...55csm0715.html

This is also a place to get solenoid, etc. and he's a really knowledgable guy
http://www.fifthaveinternetgarage.com/parts.php

thanks for setten me straight on the Muncie , sag o/d deal I just been callen em early and late GM for years. Duh.

[jtrichard]

Originally Posted by frankslagoon

Ive seen all that stuff just need the right relay. The gov does it complete the ground circiut at the relay

YES the GOV. grounds to activate the relay.. at about 27 MPH

[faribran]

Where are you guys buying the lube for these o/d trannys?

[frankslagoon]

I use reg 90w like in the rear diff. GL1