Has it been done yet? I have a 354 and I'm wanting to install a 5.7 auto trans behind my 354 Sent from my SM-G900R6 using H.A.M.B. mobile app
http://transmissionadapters.com/hemi.htm Wilcap have a kit. www.wilcap.com/392350.PDF TCI also have a kit 73RR http://www.jalopyjournal.com/forum/members/73rr.26736/
No doubt someone has done it, but what is the need? That new-fangled stuff is controlled by a computer. The 5.7 does share the same bell as the LA so the basic block adapter works but IDK what differences, if any, are on the converter. Some of the newer flex plates are 8-bolt to the crank but on a much smaller bolt circle. You have some research to do. Post a few pics as you go. .
That is not the kit I was referencing in my post. It has no applicability to the 5.7 transmission or engine. I just went to Bendtsen's site to locate what I was referring to. It is not there now......., I don't think I dreamed it, but there was a specific reference to using the Dodge 5 speed automatic behind, I think, a Chevy. Perhaps I DID dream it, but think it far more likely it was pulled for any of several possible reasons. In any case, it doesn't appear there currently. Ray
OK, I'm an Old Fudd. Clearify 5.7 please as in application. I have a 392 project with an Overdrive mopar bolted behind it. So far I have not been told it's a 5.7, just overdrive torque flight. No computer, just 2 pressure switches and 2 relays. I'm also still in build mode so a test drive hasn't happened. A real BUMMER note is my Ace Trans guy p***ed away way to soon taking the finishing touches with him. The Wizzard
The A500 is a 4 speed 904 and the A518 is a 4 speed 727 available in non computer control. 66rfe and 68 rfe use a computer.
As I remember (this started 3 years ago) my trans is a 3 year only application. 89-90-91 I believe and only in the 2 wheel drive 318ci. trucks (I also think full size Trucks). He called it a Torque flight and I think a 727. No computer but manual throttle pressure kick down rod. Does that make it a A518? Is there any external I.D. on the case to help with I.D? To add to this, it is bolted to a Willcap adapter for a normal 3 speed 727 and flex plate. The Wizzard
try this site http://www.hotrod.com/articals/43323-mopar-overdrive-transmission-swap/#p1065500_image_large
The 5 speed automatic transmission that was used with the 5.7 Hemi is called the NAG1. It is pretty much the mercedes W5A580 or 722.6. It is very strong and was used with the 6.1 in the SRT8 cars. It bolts to LA engines fine but you will need a proper flex plate. They are available. The crank overhang is different than the LA stuff. It is computer controlled and the only source I found was a PCS controller through Sound German Automotive. It is a fully programmable unit and works like a charm. The trans has a really low 1st gear for getting the heavy cars moving which is cool. You can use a 2 something gear in the rear and get the engine really loafing on the highway while maintaining great acceleration. It's a good trans to be sure.
That is some nice adapter....but no, it's not what I saw. It was on the Bendtsen's site, www.tranmissionadapters.com, and was definitely intended to adapt the late model 5 speed automatic transmission to.....Chevy engines. The late model Mopar 5 speed automatic is the Mercedes 722.6 (aka NAG1 & W5A580) transmission and is/was widely used on Diamler-Benz and MOPAR applications as well as other European brands. In recent months, I have schooled my self on these transmissions as I have an OT 300C SRT8 that has developed a problem. At this point, I stand by my story of what I saw at the time, but concede it is not to be found on Bendtsen's site anymore. I have dealt with Bob before, on a Buick straight 8 adapter. Maybe I will call him and ask for some background on that subject. Ray
It seems like there are quite a few vendors milling out adapters to put a Chevy trans on a Mercedes engine. If they have all of the X's, Y's, and Z's to do that, a couple dozen mouse clicks can make the adapter fit the other way. If Bendtsen's has the design, and is not planning on producing it, offer to buy the design. The CNC mill that I have access is a little too small to make one, but someone will have one that can. I will stand by your story too. I remember thinking "why would anyone want to do that?" Do any of the Mopar applications have the LA bell pattern?
The later 3.7 v-6, 3.9 v-6 and 4.7 v-8 share the LA block pattern but be aware of the differences in the crank. The 3.9 is simply a short 318 crank, but the others are all new design with a 'similar' 8-bolt pattern but on a smaller bolt circle. (...actually, there is more than one 'new' bolt pattern and one of them is really small...) Additionally, they may be differences in the amount of crank flange projection...I haven't looked at that yet. All of this new-fangled computer driven stuff gives me a headache. For a visual of the crank flange differences, I'll post a pic of a manual trans flywheel. In this photo, on the flywheel on the right, you can see the difference in the two 8-bolt patterns. The 'old' pattern has been placed on the newer 143 tooth, 4.7 flywheel. A 'normal' 130 tooth, 8-bolt, 426H flywheel is on the left. This is the same bolt pattern as the EarlyHemi. .
We have installed 904/A500 and 727/A518 transmission to gen 3 Hemi's with only minor modifications. Our 1st swap was in a 1964 Plymouth Sport Fury convertible using a truck 5.7 . We changed the front cover with 2005 car front cover to mount accessories down lower. We got one of the 1st 4bbl intakes from Chrysler & the prototype ign from Fast. We did this in 2005. Having done this using a nag1 would only be a problem if the starter doesn't clear. We haven't had a chance to check into this yet.
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