Barend

Whats the bolt in upgrade for the first gens? Engine is fully rebuilt to about 300 hp, transmission is rebuilt, new torque converter, etc so dont want the stock flexplate as the weak link here. Ive researched quite a bit the last several days and just not finding what im looking for. Is the 2nd gen plate a good upgrade? And im not sure whether the aftermarket billet ones from BD diesel and ATS are bolt in or require spacers. Also not looking to spend more money than i have to. Want a strong plate thats not gonna shatter when i need it most but also not building a 700hp racing truck. Just a 300hp daily driver with some towing and the possibility of turning it up more if i feel i have to.
Thanks in advance

Barend

1989 12 valve with 727

oliver foster

I do not build auto rigs often, so when I built my '76 Ramcharger with a P-pumped 12V and a 47RH. I got a SFI [?] rated flex plate from Crazy Carls.
I did note some mild interference with the inner bump out in the flex plate and the adapter plate when I was hand turning over the motor. A bit of work with the grinder made it work out fine.

I was worried about either the 1st or the 2nd gen flexplates being strong enough.
I am figuring I will have 500 HP at the flex plate with my set up.

Barend

Right, but thats a second gen setup though... Just called bd wether or not their 94-07 billet flex plate will work on my 89. Had a girl on the phone who said it wouldnt fit my 89 as its completely different, and balanced different since its a whole different motor....
i dont really believe that lol but hey who am i to question it. I think if there would be a difference its that its a little thicker and would need a spacer

BHD

Isn't the 47RH a better version of the 518, like better internal squish box parts? I think the 47rh and diesel 727 share the same bellhouse adapter? I could be wrong, I only have one auto CTD. I'm certain that the short block of all mechanical 5.9s are the same, but the 24V stuff gets a little different.

Barend

thats exactly what im not sure of either. I do find it strange that all the fancy flexplates are listed for 94-07

oliver foster

Yeah, just order it up for your '89. I was going to use that flex plate on any12V motor I choose in the shop.
As BHD said it is the same block '89-'98.0..

dguru

The best flex plate for 47RH would be the shot peened from the 08 and up. Mopar number 68005249AA

Barend

Has anybody tried this one on a first gen? Can get one cheap close by new never used

oliver foster

That looks like the one I used. Check that the locating tabs on the back do not rub on the adapter plate. I had to grind mine down a little bit.

ScubaSteveCA

Its because the 47rh/re came with a lockup TC and they are thicker, the input end of the transmission case is different to accommodate that and possibly a different size flexplate (read also 2nd gen starter) I put a goerend TC in and reused my flex plate. I had to replace my a518/46rh transmission case and they're specific to our diesel 89-93 application.

Dave? at goerend is very helpful for old dodge diesel applications and he had better ones if you haven't sourced one yet. He also talked me out of a low stall even though I thought that's what I wanted

dguru

I got one about 10 years ago and Dave tried to talk me out of low stall but I held my ground. Engine will sometimes stall when cold and A/C is on in gear when you let off throttle quick. Idle about 600RPM. My service truck weighs 8500 lbs and I pull 10K trailers. I like it with low stall.