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Overdrive trans change over #3051216
06/17/22 10:33 AM
06/17/22 10:33 AM
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fredericksburg,va
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cudaman1969 Offline OP
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fredericksburg,va
Two trucks 79 and 88 both had regular trans, I’m planning to install the overdrive 518 in both and wondering if the trans mount can adapt to the overdrive?

Re: Overdrive trans change over [Re: cudaman1969] #3051225
06/17/22 11:02 AM
06/17/22 11:02 AM
Joined: Nov 2003
Posts: 10,228
Colleyville
3hundred Offline
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Colleyville
Originally Posted by cudaman1969
Two trucks 79 and 88 both had regular trans, I’m planning to install the overdrive 518 in both and wondering if the trans mount can adapt to the overdrive?


With some fabrication you can make it work. IIRC, I made an "adapter" steel plate to attach the three bolt pattern OD to the two bolt pattern non OD pattern in 1991. Couldn't find a newer truck in the JY at the time. Not too much trouble. Driveline angle is the hard part. For that I had to cut, fabricate reinforcements and lower the center portion of the crossmember. Find an OD crossmember and save a lot of trouble.


'68 Fury Convertible
'69 300 Convertible
'15 Durango 5.7 Hemi
'16 300 S Hemi
Re: Overdrive trans change over [Re: 3hundred] #3051254
06/17/22 12:19 PM
06/17/22 12:19 PM
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fredericksburg,va
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cudaman1969 Offline OP
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Originally Posted by 3hundred
Originally Posted by cudaman1969
Two trucks 79 and 88 both had regular trans, I’m planning to install the overdrive 518 in both and wondering if the trans mount can adapt to the overdrive?


With some fabrication you can make it work. IIRC, I made an "adapter" steel plate to attach the three bolt pattern OD to the two bolt pattern non OD pattern in 1991. Couldn't find a newer truck in the JY at the time. Not too much trouble. Driveline angle is the hard part. For that I had to cut, fabricate reinforcements and lower the center portion of the crossmember. Find an OD crossmember and save a lot of trouble.

A bolt in thing?

Re: Overdrive trans change over [Re: cudaman1969] #3051268
06/17/22 01:04 PM
06/17/22 01:04 PM
Joined: Nov 2003
Posts: 10,228
Colleyville
3hundred Offline
I Live Here
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Joined: Nov 2003
Posts: 10,228
Colleyville
Originally Posted by cudaman1969
Originally Posted by 3hundred
Originally Posted by cudaman1969
Two trucks 79 and 88 both had regular trans, I’m planning to install the overdrive 518 in both and wondering if the trans mount can adapt to the overdrive?


With some fabrication you can make it work. IIRC, I made an "adapter" steel plate to attach the three bolt pattern OD to the two bolt pattern non OD pattern in 1991. Couldn't find a newer truck in the JY at the time. Not too much trouble. Driveline angle is the hard part. For that I had to cut, fabricate reinforcements and lower the center portion of the crossmember. Find an OD crossmember and save a lot of trouble.

A bolt in thing?


IIRC, we welded it to the existing mount, thinking we had bolt clearance issues. I remember we smoked the rubber mount, might want to start with a poly mount? The "adapter" plate matched the 3 bolt pattern of the OD trans. We should have added an offset bend, there's also an elevation change between the 2 bolts and single bolt. We used washers to make up the difference, not the best but it worked.

edit: oh the crossmember? Yeah, I think so. I finally sourced one but never got around to installing it before I sold the truck. There's a LOT of different part numbers, I think they're all interchangeable. You may have to drill new holes in the frame, the OD is 6 15/16" longer than the non OD. We used the welding on of the adapter plate to make up the difference.

Last edited by 3hundred; 06/17/22 01:07 PM.

'68 Fury Convertible
'69 300 Convertible
'15 Durango 5.7 Hemi
'16 300 S Hemi
Re: Overdrive trans change over [Re: cudaman1969] #3051316
06/17/22 03:52 PM
06/17/22 03:52 PM
Joined: Dec 2009
Posts: 20,600
in a cattle trailer down by th...
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Guitar Jones Offline
Paddle faster! I hear banjo music!
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in a cattle trailer down by th...
crossmember

adapter plate

mount

This worked for my NV4500 swap. I didn't need the adapter plate as the mount bolted directly to the trans.

received_513290673875511.jpeg

"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: Overdrive trans change over [Re: Guitar Jones] #3051324
06/17/22 04:18 PM
06/17/22 04:18 PM
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Posts: 4,366
Michigan
MarkZ Offline
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Michigan
That is a work of art.


1987 Fifth Avenue - 512/518/D60
Re: Overdrive trans change over [Re: MarkZ] #3051348
06/17/22 05:57 PM
06/17/22 05:57 PM
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Posts: 8,192
fredericksburg,va
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cudaman1969 Offline OP
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fredericksburg,va
Thanks, great ideas so far

Re: Overdrive trans change over [Re: cudaman1969] #3051564
06/18/22 06:59 PM
06/18/22 06:59 PM
Joined: Jan 2021
Posts: 327
delhi,il
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trw1982 Offline
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trw1982  Offline
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delhi,il
look at mopar parts giant. it appears that there are 2 different setups. i just went thru this when i shortened an 86 long bed frame to a short bed frame. i thought that i had all the right stuff but things did not work out correctly. i went to two different pick/pull yards and found 3 trucks to pull the stuff off of. 2 were different. i still try to collect the stuff as i have a bunch of trucks. look at the p/p's.

Re: Overdrive trans change over [Re: trw1982] #3051576
06/18/22 07:56 PM
06/18/22 07:56 PM
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Posts: 8,192
fredericksburg,va
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cudaman1969 Offline OP
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fredericksburg,va
Thanks, I’ll try to use the mounts off both vans somehow. 92 and 94

Re: Overdrive trans change over [Re: cudaman1969] #3052255
06/21/22 08:59 PM
06/21/22 08:59 PM
Joined: Apr 2007
Posts: 934
Central Michigan
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nuthinbutmopar Offline
super stock
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Joined: Apr 2007
Posts: 934
Central Michigan
I swapped my '71 Sweptline and my wife's '79 LRE from 727 to 518. Built adapters for both that bolted to the factory crossmember...not pretty but they've both done over 20,000 miles with no issues. If you've got the mount to go with the 518 and average fab skills it's not a big deal. You CAN do the "work of art" mount if you've got the skills and equipment. With the pressure and vacuum switch setup for shifting the OD and lockup, it's an awesome swap and well worth doing.

Re: Overdrive trans change over [Re: nuthinbutmopar] #3062893
07/27/22 03:03 AM
07/27/22 03:03 AM
Joined: Jun 2004
Posts: 767
NW PA
V10nacuda Offline
super stock
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Joined: Jun 2004
Posts: 767
NW PA
Last one I did was a two-wheel drive D100. Crossmember out of a 92 Ramcharger was used. set it in the frame drilled six holes and everything was bolt in. And note to self when using a plasma cutter for piercing the holes in the cab is on the frame. Make sure you stick some heavy steel between the two otherwise you'll have a hole in the floorboard. Ask me how I know🤣







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