408W 4R70W flexplate

[67 Halfcab]

Finally have my Fordstrokers 408W sitting in my garage, and am picking up the last few pieces to get it installed.

I am trying to pick out a neutral balance flexplate to bolt up to my 4R70W. Going through the Summit Racing website, reviews of their available flexplates are all over the place. Does anyone have a recommendation for one that worked out for them? Should I get an SFI flexplate?

Thanks!

Jamie

 

[Broncobowsher]

Neutral balance, I'm pretty sure a 4.2 V6 would work.

Not knowing how mild or wild the engine is, can't really comment for what you need above a stock replacement. Be sure to find a C4/AOD/4R70W version. Don't get one for a C6 or E4OD (Why I didn't recommend the 300 version)

 

[nvrstuk]

Summit didn't used to have a neutral balance flex plate for a 408 that would fit my billet TC. I had to buy a 28 oz one and have it rebalanced. The mounting pads on the flex plate were .030 to .060" offset towards the transmission side and the tc was bound without being tightened. I found this by accident and had tons of info, correct part numbers the whole 9 yards on a different web site and it crashed and lost my entire build including that valuable info.

Just letting you know that there are different ones and some will not fit even tho they state they will... so don't leave out the option of just rebalancing it.

My .02, don't buy a THING from Perf Auto. Seems like most of there stuff is not high quality... good luck\

 

[rcmbronc]

I used this one.

https://www.competitionproducts.com...rnal/productinfo/SCAFP-302N-SFI/#.XxmJWJ5KiUk

 

[67 Halfcab]

Summit didn't used to have a neutral balance flex plate for a 408 that would fit my billet TC. I had to buy a 28 oz one and have it rebalanced. The mounting pads on the flex plate were .030 to .060" offset towards the transmission side and the tc was bound without being tightened. I found this by accident and had tons of info, correct part numbers the whole 9 yards on a different web site and it crashed and lost my entire build including that valuable info.

Just letting you know that there are different ones and some will not fit even tho they state they will... so don't leave out the option of just rebalancing it.

My .02, don't buy a THING from Perf Auto. Seems like most of there stuff is not high quality... good luck\

I thought about getting my current flexplate bolted to my 5.0 rebalanced, but I was also leaning towards getting a new one that was SFI approved. I guess the benefit of rebalancing my old one is that I know it works.

 

[67 Halfcab]

I used this one.

https://www.competitionproducts.com...rnal/productinfo/SCAFP-302N-SFI/#.XxmJWJ5KiUk

How long ago did you purchase the Scat flexplate? I ask because it was one of the first ones I was looking at online but saw that some people were complaining about excess runout.

 

[EricLar80]

Unless you are drag racing, there is no sense in getting on that is SFI approved...

 

[rcmbronc]

How long ago did you purchase the Scat flexplate? I ask because it was one of the first ones I was looking at online but saw that some people were complaining about excess runout.

I bought it two years ago. No issues on my end but honestly I never double checked the run out.