Adding OD to my '67

[vping]

As ya'll may know my car is a '67 GT https://s70.photobucket.com/albums/i87/vping/1967%20MG%20BGT/ but recently I picked up a '74 GT that happened to have OD. I am slowly coming to the realization that the '74 https://s70.photobucket.com/albums/i87/vping/1974%20MG%20BGT/ might be beyond repair. So I in turn have an entire car's worth of parts and this OD unit.

My '67 currently has a '68 trans in it so the tunnel has been "banged out" to accomodate.

What else might I need to do to put this in. The OD is a black lable laycock overdrive.

The '74 has 42,000 documented miles on it driven by the original little old lady owner until she gave it to me.

 

[Steve_S]

I have a '72 OD unit in my 67. The previous owner did the installation, but if I can be of help let me know. If your '67 is early, you won't need the reversing lamp switch.

 

[vping]

There is one tidbit. Yes it is early and does not have reverse lights. One less thing to worry about.

 

[LLAngus]

Tony--This is the type of OD I have in the Red Bull. (see previous posted picture) /ubbthreads/images/graemlins/driving.gif

 

[tony barnhill]

WOO-HOO!!!

 

[Steve_S]

If you wanna sell that reversing switch let me know. /ubbthreads/images/graemlins/wink.gif

 

[LLAngus]

SOOOOooo, This is a good thing? I will probably need advice on hooking up the trans when time comes.

 

[vping]

I guess this will be as easy as pulling the motor & tans and swapping it out. Should I do anything to the OD before I put it in? How can I check it for proper operation?

 

[vping]

If you wanna sell that reversing switch let me know. <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />

If & when I figure out and am able to get to it, I will get in touch with you about the switch.

 

[Steve_S]

Unless you rebuild the transmission, you're taking a gamble. It may be fine as is, but then again it may not be. Good luck whichever way you go!

 

[vping]

So I should pull the '74 and have it re-built. What might that run me?

 

[Steve_S]

It ain't cheap. That's the only reason I'm not telling you to rebuild it regardless. Sometimes it works out fine, and sometimes a problem develops and you have to pull it all out again to rebuild. Then again, sometimes a fresh rebuild develops a problem. I'd try to determine the condition of the gearbox. If it looks fresh then it may be worth a chance.

 

[tony barnhill]

For all the hassle of installing, I'd make sure its operational & problem-free before installing...

 

[Tony_C]

You'll need a new speedo cable, some sort of switch and wiring harness to activate the OD (probably can use parts from donor car) I think the driveshaft is the same. You can check by measuring standard 4 speed from bell housing to tail shaft and comparing to the OD unit. You also have a driveshaft in the donor car. I'm pretty sure everythin else lines up.

 

[vping]

Is there a way to visually bench inspect a trans? I thought about getting the donor car running but then the hassle of doing that is.....

 

[tony barnhill]

Electric motor with a pulley..another pulley on end of trans...hold trans down on table with some type strapping...fire up electric motor...get trans turning to speed, turn off motor, engage clutch, shift, turn on motor

 

[vping]

I understand the pulley on the front. What it the rear pulley for. Watching?

 

[Scott_Hower]

I understand the pulley on the front. What it the rear pulley for. Watching?

1. a pulley on front of electric motor.
2. a pulley on front of gearbox (first motion shaft) would be ideal. You may need to use the tailshaft flange instead, as I seem to recall the FMS is inside the bellhousing.
3. v-belt arrangement to connect them.

Some other random thoughts...

Align *very* carefully. Watch the pulley ratios. Make certain you're spinning it in the right direction. Fill box with new oil. An old 3450RPM motor (like from a washing machine or somesuch) with a 1:1 ratio should be just fine. Probably needs to be a couple of HP to spin it fast enough for the OD to pump up

I looked into having https://www.emachineshop.com make up the rear pulley in aluminum, but never finished the drawing. It would be pretty simple.

 

[DrEntropy]

I'm gonna stick my nose in here and offer up an opinion... Without doing a full tear-down and visual inspection you're chancing that:

A) It may be fine.
B) It may be "half-fine" and work for a while.
C) It may be in need of work now that will break more $$ bits with first torque applied.

With only three possibles, I'd take it apart and find out on a bench rather than after it's in the car. You've a 33.333% chance it'll work correctly for any length of time. At the very least you'll be able to renew the layshaft, bearings & seals and KNOW what it's got. Do the second gear baulk ring while in there. The O/D can be cleaned well, O-rings & check balls renewed.

It's WINTER, Vince! ...but half-over now so ya better get to stitchin'! /bcforum/images/%%GRAEMLIN_URL%%/grin.gif

 

[vping]

You know my MO. Can I do this myself?
You also know if I pull my motor I might want to "do stuff" to it while it's out, won't I?(please say no, please say no, please say no)