I have a 65 chey longbed stepside. I recently swapped the sm318 for a sm420. I have the foam seal that goes between the removable floor panel and the transmission. There is a gap it does not form a tight seal. I spoke with an older gentleman friend of mine that has been breakin and fixin cars and trucks for probably 50 years. He tells me that there is a metal plate that sets on top of the transmission and then the seal goes on. The way he described it was that the top of the transmission is not flat on top so there is a plate with different length legs to compensate for the uneven surface on the top of the transmission. It creates a perch for the seal and it would sandwich between the plate and floor pan. Anybody familiar with this item? Pics or part number?
Never seen a plate like that on our trucks equipted with the SM420. Didyou replace he foam seal ?? A new one may provide a better seal, it did on mine before I went with the 700 R4 ! Our hosts here can hook you up... dval
Yes. I have a new seal and shifter boot. Perhaps I'm missing something here. Classic Parts #40-511. Do I not just drop this down over the shifter onto the top of the transmission and then the sheet metal pan and then the boot? The seal fits sloppy. Its not compressed.
Yup, that's about it !! I don't think it's intended to compress like a door jam seal. The weather tight seal is the shifter boot and trim ring screwed to the floor.. dv
I have an all original 65 lwb with the granny four speed. I have never seen a metal plate like you describe although it seems like it would make sense. We had the same problem with the seal not compressing when the removeable floor pan is reinstalled. We just used two of those seals stacked and it seemed to work ok great. Hope this helps.
