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518 to 727 swap? #2849356
11/21/20 01:25 AM
11/21/20 01:25 AM
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TLT Offline OP
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I'm wanting to do the opposite of what most people do, I have a 1990 2wd Ramcharger with a TBI 360/518 combo that I'm converting to a 360 carb with a 727, what do I have to do to the transmission crossmember to put a 727 in? Or do I have to get an earlier 727 crossmember? I have the throttle body to carb issues figured out, it's the tranny swap that is giving me problems.

Re: 518 to 727 swap? [Re: TLT] #2849402
11/21/20 08:13 AM
11/21/20 08:13 AM
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Why get rid of the overdrive?

But, iirc the cross member needs moved forward, the holes are probably there. The mount itself might be different. You will need a longer driveshaft. Linkage swaps 100 percent. Use your existing speedo drive. Cooler lines are same.


Angry white pureblood male
Re: 518 to 727 swap? [Re: ruderunner] #2849498
11/21/20 12:13 PM
11/21/20 12:13 PM
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I'm wondering why as well. With it being a 1990 it should be a non-lockup model as well. Either control OD with just a toggle switch or automate it with a vacuum and pressure switch. It's damn easy to do.

If your 727 is also a non-lockup model then the converter will swap over.

The TBI blows though and lots of people ditch it for a carb.


1987 Fifth Avenue - 512/518/D60
Re: 518 to 727 swap? [Re: MarkZ] #2849555
11/21/20 01:46 PM
11/21/20 01:46 PM
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i believe the cooler lines for the 727 are 5/16" while the lines for the 518 are 3/8".
the case fitting size of the 727 is 1/8" NPT. i'm not sure if the 518 case is the same or not, but if not, a simple fitting change for the 727 is all that's required to use your 518 lines.
beer

Re: 518 to 727 swap? [Re: moparx] #2849570
11/21/20 02:23 PM
11/21/20 02:23 PM
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dIc dOc Deity ! Offline
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x 99 .. WHY .. get rid of the OD ?

Good to see oldham2 is up from his nap !

Re: 518 to 727 swap? [Re: dIc dOc Deity !] #2849575
11/21/20 02:28 PM
11/21/20 02:28 PM
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moparx Offline
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HaY DoC............. i'll have you know i'm not only UP, but i got a load of LaUnDrY done, and soon, i'm off to the store to get groceries ! wave
beer

Re: 518 to 727 swap? [Re: moparx] #2849577
11/21/20 02:33 PM
11/21/20 02:33 PM
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French Laundry? grin

Re: 518 to 727 swap? [Re: dIc dOc Deity !] #2849582
11/21/20 02:39 PM
11/21/20 02:39 PM
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jcc Offline
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Originally Posted by Doc Fiberglass
French Laundry? grin

work
Meaning it could be washed in a teacup?


Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: 518 to 727 swap? [Re: TLT] #2849596
11/21/20 02:53 PM
11/21/20 02:53 PM
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Originally Posted by TLT
I'm wanting to do the opposite of what most people do, I have a 1990 2wd Ramcharger with a TBI 360/518 combo that I'm converting to a 360 carb with a 727, what do I have to do to the transmission crossmember to put a 727 in? Or do I have to get an earlier 727 crossmember? I have the throttle body to carb issues figured out, it's the tranny swap that is giving me problems.


I went the other way with my '82, 904 to A500. I fabricated a mount for the A500 (3 bolt vs 2 bolt) and relocated the crossmember. I would have been better off with the correct crossmember. Totally forgot about driveline angles. The elevation needs to change as well. I found that there were different crossmember part numbers by year, even though they seem indistinguishable from each other.


'68 Fury Convertible
'69 300 Convertible
'15 Durango 5.7 Hemi
'16 300 S Hemi
Re: 518 to 727 swap? [Re: jcc] #2849892
11/22/20 12:34 PM
11/22/20 12:34 PM
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Originally Posted by jcc
Originally Posted by Doc Fiberglass
French Laundry? grin

work
Meaning it could be washed in a teacup?



sorry guys, my "tighty white-ies" don't fit in a tea cup. i don't drink tea either........... laugh2
beer

Re: 518 to 727 swap? [Re: moparx] #2849998
11/22/20 04:12 PM
11/22/20 04:12 PM
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MORE LIKE a 5 gallon pail ? eek grin

Re: 518 to 727 swap? [Re: 3hundred] #2850105
11/22/20 07:32 PM
11/22/20 07:32 PM
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Thanks guys, we are building a street toy, 1990 2wd Ramcharger, no need for OD on this, have a fresh built 727, new high stall converter as well. Eliminating the computer and TBI, going with a carb on a strong 360. I was just hoping an earlier crossmember from a mid 80's or so pickup would bolt in.

Re: 518 to 727 swap? [Re: TLT] #2850132
11/22/20 08:32 PM
11/22/20 08:32 PM
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Originally Posted by TLT
Thanks guys, we are building a street toy, 1990 2wd Ramcharger, no need for OD on this, have a fresh built 727, new high stall converter as well. Eliminating the computer and TBI, going with a carb on a strong 360. I was just hoping an earlier crossmember from a mid 80's or so pickup would bolt in.


I don't remember for certain. I recall I was looking for Ramcharger crossmembers, I can't recall why I wasn't looking into pickups, an obvious connection. I'm thinking I knew something then I've forgotten. Good luck with your swap. If you elect to keep the OD, you can operate it with two toggle switches, which I did, or you can automate it with some pretty simple mods while losing the computer.


'68 Fury Convertible
'69 300 Convertible
'15 Durango 5.7 Hemi
'16 300 S Hemi






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