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Re: A518 trans [Re: A727Tflite] #2448767
02/08/18 10:51 PM
02/08/18 10:51 PM
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Atlanta, GA
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mgoblue9798 Offline
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Atlanta, GA
So, this is an out there question. If I were to change to intake, carb, and put electronic ignition on an OBD2 magnum, would the transmission shift shift manually through 1,2,3? This is a SHTF scenario I have wondered about.

Re: A518 trans [Re: tuff440] #2448772
02/08/18 11:00 PM
02/08/18 11:00 PM
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Michigan
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A727Tflite Offline
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RH will shift fully auto 1,2,3.

RE will launch in 3rd with electronics dead since in default the governor solenoid is not being modulated ( so you develop full governor pressure ) so if you pull it in manual low it should launch in 1st then you can upshift manually.

Not the greatest for control but if it hits the fan you can get home.

Re: A518 trans [Re: A727Tflite] #2448776
02/08/18 11:10 PM
02/08/18 11:10 PM
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Atlanta, GA
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mgoblue9798 Offline
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Thank you very much sir.

Re: A518 trans [Re: J_BODY] #2448789
02/08/18 11:29 PM
02/08/18 11:29 PM
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Texas, USA
ChrgrCuda Offline
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Texas, USA
Originally Posted By J_BODY
Pro Trans builds and has the adapters to put a 518/46RH behind a big block. Darren is installing one in his Coronet project. They have picts on their Facebook page from Sept 13.

Thanks J_Body. I think I read that the 518 was hard to fit in a B-Body, but can be done. I'll try to find the Pro Trans FB page.


68 Cuda Notchback [Email]10.86@120[/Email] 69 Charger R/T 440/505 2009 Challenger SRT8
Re: A518 trans [Re: tuff440] #2448796
02/08/18 11:38 PM
02/08/18 11:38 PM
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Posts: 4,205
New York
polyspheric Offline
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New York
GV makes a version for the PG (now) that splits gears, making the 2-speed a 3-speed with the overdrive, but also creating an intermediate gear between 1st and 2nd.
This can be done manually with a 727 conversion + GV, not sure if it's possible to do electronically (rather than try to juggle both controls).
The results for a 727:
1st 2.45:1
1st + GV 1.91:1
2nd 1.45:1
2nd + GV 1.13:1
3rd 1.00:1
3rd + GV .78:1


Boffin Emeritus
Re: A518 trans [Re: mgoblue9798] #2448797
02/08/18 11:38 PM
02/08/18 11:38 PM
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Benton, IL.
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DaveRS23 Offline
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Originally Posted By mgoblue9798
To the same level that a properly built 727 will- provided you don't hot rod it with OD engaged. Transmissions are really rated on torque output not horsepower anyways.


Correct me if I'm wrong here, but don't the first 3 gears go through an additional clutch pack in the 518s? A clutch pack that must release for OD. Without proper attention, that could be a point of concern that 727s don't have.


Master, again and still
Re: A518 trans [Re: tuff440] #2448801
02/08/18 11:46 PM
02/08/18 11:46 PM
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Michigan
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A727Tflite Offline
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The power from the trans goes through the over running clutch (ORC) and direct clutch in the overdrive unit. I have never seen a failed ORC and direct clutch in the over drive as long as the trans was assembled correctly. The same direct clutch and ORC is use daily in the diesel units as the gas units.

The direct clutch is also used in reverse and is used to slow the vehicle down on coast in forward gears.

The clutch that needs proper attention is the overdrive clutch because the correct shim must be used on the OD piston to time the release of the direct with the application of the OD.

Re: A518 trans [Re: tuff440] #2448804
02/08/18 11:54 PM
02/08/18 11:54 PM
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Akron, Ohio
ProSport Offline
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Akron, Ohio
Are there any trans tunnel mods needed in a B-body for the 518 trans?
I know it's a pretty large amount of work in an A-body.

Even though the Gearvendors is only a .78 overdrive I think it would be good enough for me and an easier install. And I like how it will handle full power for an occasional highway brawl.


1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
Re: A518 trans [Re: ProSport] #2448812
02/09/18 12:00 AM
02/09/18 12:00 AM
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Posts: 941
Texas, USA
ChrgrCuda Offline
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Texas, USA
Originally Posted By ProSport
Are there any trans tunnel mods needed in a B-body for the 518 trans?
I know it's a pretty large amount of work in an A-body.

Even though the Gearvendors is only a .78 overdrive I think it would be good enough for me and an easier install. And I like how it will handle full power for an occasional highway brawl.

That's kind of what I was thinking. I have 3.73's with a CRT 727 and I'm turning around 3000 RPM's at 55-60. I know GV is only .78 vs. .69 but if I can keep it around 24-2500 at 70mph I'm good.


68 Cuda Notchback [Email]10.86@120[/Email] 69 Charger R/T 440/505 2009 Challenger SRT8
Re: A518 trans [Re: mgoblue9798] #2448896
02/09/18 01:52 AM
02/09/18 01:52 AM
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Michigan
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A727Tflite Offline
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Michigan
Originally Posted By mgoblue9798
To the same level that a properly built 727 will- provided you don't hot rod it with OD engaged. Transmissions are really rated on torque output not horsepower anyways.


The last year the Dodge Cummins package used the 48RE OD trans was 2007. Like I stated earlier the geartrain in the OD unit was pretty much the same between gas and diesel.

For 2007 the Cummins made over 600 lbs. ft. of torque. Max GCWR was approx. 20K.

I don't think your torque and vehicle weight will stress the OD like the Cummins will.

Re: A518 trans [Re: ChrgrCuda] #2449041
02/09/18 12:01 PM
02/09/18 12:01 PM
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Posts: 4,366
Michigan
MarkZ Offline
Worthy
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Michigan
Originally Posted By ChrgrCuda
Originally Posted By ProSport
Are there any trans tunnel mods needed in a B-body for the 518 trans?
I know it's a pretty large amount of work in an A-body.

Even though the Gearvendors is only a .78 overdrive I think it would be good enough for me and an easier install. And I like how it will handle full power for an occasional highway brawl.

That's kind of what I was thinking. I have 3.73's with a CRT 727 and I'm turning around 3000 RPM's at 55-60. I know GV is only .78 vs. .69 but if I can keep it around 24-2500 at 70mph I'm good.


I'm a fan of the 518. I have one behind a 512 stroker mated with an Ultra Bell. Between the bell, converter and transmission I've got about $1800 into it. OD shifts are controlled with a pressure switch and a vacuum switch. If you've already got a trans built by CRT though I'd be inclined to go with the GV too.


1987 Fifth Avenue - 512/518/D60
Re: A518 trans [Re: hudsonhornet7x] #2449112
02/09/18 02:51 PM
02/09/18 02:51 PM
Joined: Oct 2003
Posts: 996
Queens, New York
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Harley Offline
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Queens, New York
Originally Posted By hudsonhornet7x
Will the A518 trans survive a 700 hp engine in a 68 B body?


Good question.

Re: A518 trans [Re: hudsonhornet7x] #2449116
02/09/18 03:17 PM
02/09/18 03:17 PM
Joined: Jan 2006
Posts: 1,400
Trumbauersville PA
ric3xrt Offline
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Trumbauersville PA
Originally Posted By hudsonhornet7x
Will the A518 trans survive a 700 hp engine in a 68 B body?



Yes


Truth has no agenda, but those with an agenda make their own truth.
Some of us are so open minded they only see their View



Re: A518 trans [Re: tuff440] #2449157
02/09/18 05:23 PM
02/09/18 05:23 PM
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Posts: 859
lancaster,california
johnnycuda Offline
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lancaster,california
Darren at ProTrans built my buddies A518 for his '66 Coronet, needed quite a bit of work to the tunnel and floor to get it in.
He has a 470" motor, bottom 11's on motor, low 10s on juice, his has a lockup convertor.
I have a GV in my '70 Cuda, only had to trim the trans crossmember some and put a few dents in the floorboard to get it in.


1970 'Cuda,Lime Light,499 Indy S/R's 10.70's @125,street driven ALOT!
1966 Barracuda 360,now a 5spd,Hemi Orange,Hot Rod Air,
New daily driver-2003 Ram 2500 Cummins 5.9
'69 Valiant 2-dr, sleeper!
New project---1938 Dodge truck, plan is a 360 with a A500, AC, Calvert rear susp., rack and pinion front with coils.
Re: A518 trans [Re: tuff440] #2449380
02/10/18 02:05 AM
02/10/18 02:05 AM
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Posts: 4,254
Canada
WO23Coronet Offline
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Canada
Can they be built to tow in OD and live? Say a 5500lb truck towing a 8-9K loaded car hauler?

Re: A518 trans [Re: tuff440] #2449392
02/10/18 02:41 AM
02/10/18 02:41 AM
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Michigan
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A727Tflite Offline
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Michigan
Read my earlier post - the over drive unit is pretty much the same from gas to diesel - and the Cummins with this trans can haul 20k lbs.

Use ATF - 4 and nothing else. Put a trans temp gauge with the pickup in the pan and make sure you have a good cooler. You'll be fine.

Last edited by Transman; 02/10/18 02:42 AM.
Re: A518 trans [Re: WO23Coronet] #2449424
02/10/18 09:01 AM
02/10/18 09:01 AM
Joined: Dec 2009
Posts: 20,600
in a cattle trailer down by th...
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Guitar Jones Offline
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in a cattle trailer down by th...
Originally Posted By WO23Coronet
Can they be built to tow in OD and live? Say a 5500lb truck towing a 8-9K loaded car hauler?


I've towed my 30' enclosed at around 12K lbs. with a 47RH and a 48RE with never a problem. Never turned the O/D off. I used to tow about 5K lbs around with my 5.2 Dakota and a 518 (46RH) and had no problems with that either.


"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.
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