Are the trans to block plates interchangeable?

[DK77]

So... I think I installed the 6 speed plate that goes between the trans and block when I put in the 5 speed. Do I need to pull the tranny and swap them or should I be ok?

[DK77]

Here are the difference between the two. Left is 5 speed, right is 6 speed. From 3SX

[RealMcCoy]

The difference is actually four bolt and two bolt block, not trans trans type. ASA lists the later style plate for a 93 year model car, which had a 5 speed, so you should be fine...

[Alex3000gt]

I do know that FWD ATX to FWD MTX is definitely different, the starter is in a slightly different position. I found this out the hard way.

Couldn't comment on AWD.

[DrGonzo]

Another question, what is it's purpose?

[RealMcCoy]

Another question, what is it's purpose?

I would assume that it's just an easy way to allow multiple transaxle/transmission/flywheel options to be bolted to one block with minimal changes.

[DrGonzo]

I would assume that it's just an easy way to allow multiple transaxle/transmission/flywheel options to be bolted to one block with minimal changes.

Confused, Not seeing how that 2-3mm plate will affect the bolt pattern of the block.

Just asking as when I put together my last engine I found out I forgot to put it on. car runs fine so wondering the purpose of it.

[Greg E]

I speculate its just a drive line shield to help deter false knock from going over bumps in the road.

[Alex3000gt]

Usually you see some squishy gasket when you don't want to induce point loads or stresses due to uneven surface finish. It is possible that the flexible metal block plate exists to "squish" and help even out the mating between the block and the transmission. This is just speculation.

The secondary, and actually this is probably the primary reason - is that it closes off the air gaps around the starter and oil pan - preventing debris from hopping up off the road and into your bell housing.

[DK77]

My guess would be that it's primarily to shield the bellhousing from debris as well. I think I'll be ok as the newer one has more clearance than the older one.

Here is the newer plate laid over the older plate.