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#2448767 - 02/08/18 07:51 PM Re: A518 trans [Re: Transman]
mgoblue9798 Offline
member

Registered: 03/16/10
Posts: 158
Loc: 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.

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#2448772 - 02/08/18 08:00 PM Re: A518 trans [Re: tuff440]
Transman Offline
super stock

Registered: 03/27/11
Posts: 713
Loc: Michigan
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.

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#2448776 - 02/08/18 08:10 PM Re: A518 trans [Re: Transman]
mgoblue9798 Offline
member

Registered: 03/16/10
Posts: 158
Loc: Atlanta, GA
Thank you very much sir.

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#2448789 - 02/08/18 08:29 PM Re: A518 trans [Re: J_BODY]
ChrgrCuda Offline
super stock

Registered: 08/24/08
Posts: 755
Loc: 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

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#2448796 - 02/08/18 08:38 PM Re: A518 trans [Re: tuff440]
polyspheric Offline
master

Registered: 10/10/07
Posts: 2567
Loc: 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
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Boffin Emeritus

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#2448797 - 02/08/18 08:38 PM Re: A518 trans [Re: mgoblue9798]
DaveRS23 Offline
master

Registered: 01/20/03
Posts: 4590
Loc: Benton, IL.
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.
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KOS

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#2448801 - 02/08/18 08:46 PM Re: A518 trans [Re: tuff440]
Transman Offline
super stock

Registered: 03/27/11
Posts: 713
Loc: Michigan
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.

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#2448804 - 02/08/18 08:54 PM Re: A518 trans [Re: tuff440]
ProSport Offline
I Live Here

Registered: 01/20/03
Posts: 17536
Loc: 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.
_________________________
Sassy Grass street Duster, best of 10.69 at 124 driven to the track with 3.23 gears, naturally aspirated on 93 octane.

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#2448812 - 02/08/18 09:00 PM Re: A518 trans [Re: ProSport]
ChrgrCuda Offline
super stock

Registered: 08/24/08
Posts: 755
Loc: 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

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#2448896 - 02/08/18 10:52 PM Re: A518 trans [Re: mgoblue9798]
Transman Offline
super stock

Registered: 03/27/11
Posts: 713
Loc: 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.

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#2449041 - 02/09/18 09:01 AM Re: A518 trans [Re: ChrgrCuda]
MarkM Offline
Worthy

Registered: 01/13/05
Posts: 2174
Loc: USA, MI
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.
_________________________
'87 Fifth Avenue: 512 low deck roller / 518 / 8.75


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#2449112 - 02/09/18 11:51 AM Re: A518 trans [Re: hudsonhornet7x]
Harley Offline
super stock

Registered: 10/30/03
Posts: 974
Loc: Queens, New York
Originally Posted By hudsonhornet7x
Will the A518 trans survive a 700 hp engine in a 68 B body?


Good question.

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#2449116 - 02/09/18 12:17 PM Re: A518 trans [Re: hudsonhornet7x]
ric3xrt Offline
super stock

Registered: 01/13/06
Posts: 1029
Loc: Trumbauersville PA
Originally Posted By hudsonhornet7x
Will the A518 trans survive a 700 hp engine in a 68 B body?



Yes
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Truth has no agenda, but those with an agenda don't always acknowledge truth
74 D100 D-Code,3x75 D100 D-code, 3x77 D100 D-code,6x78 D150 D-D-code...lots of pre 81 trucks
75 4x2 Ramcharger....G3 coming soon
2003 Ram st
2004 Rumble Bee
2004 Ram GTX(Plum Crazy)
2005 Ram GTXtreme(s Plum Crazy,Banana Yellow)
Any info on these trucks is greatly appreciated
2005 Ram 1500 (drag truck in building)
2014 1500 tradesman(shhhh, it's hiding a 7.0 short block under those eagle heads.

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#2449157 - 02/09/18 02:23 PM Re: A518 trans [Re: tuff440]
johnnycuda Offline
super stock

Registered: 03/19/08
Posts: 703
Loc: 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
2000 Dodge Ram,360 2wd.
New project-'69 Valiant 2-dr, budget sleeper!

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#2449380 - 02/09/18 11:05 PM Re: A518 trans [Re: tuff440]
WO23Coronet Offline
master

Registered: 01/08/08
Posts: 4019
Loc: Canada
Can they be built to tow in OD and live? Say a 5500lb truck towing a 8-9K loaded car hauler?

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#2449392 - 02/09/18 11:41 PM Re: A518 trans [Re: tuff440]
Transman Offline
super stock

Registered: 03/27/11
Posts: 713
Loc: 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.


Edited by Transman (02/09/18 11:42 PM)

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#2449424 - 02/10/18 06:01 AM Re: A518 trans [Re: WO23Coronet]
Guitar Jones Offline
master

Registered: 12/18/09
Posts: 9524
Loc: 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.
_________________________
W5 408 cid, 1.324, 6.155 @ 110.34, 9.756 @ 134.67. Oh yeah, it's all Mopar too, 904 trans and an 8.75 rear!!

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