Converter and gear swap.

[Bad Sport]

I'm planning on running the current 3.55 setup I have for street use. I am going to be putting together a 4.56 spool setup for strip use.

I have already talked with Kenny at PTC and he said he could put together a converter that will work with both. Obviously it will be tighter on the 4.56 if set up for the 3.55's, and I understand that going in.

Here's my question.

Does anyone here have a similar setup?

How does it perform with the numerically higher gear?

 

[clinteg]

With 28" tires and 4.10 gears I run about 3100 rpm at 60 mph with an 8" 5500 converter. What size converter and stall speed is PTC looking to do for you? I'd imagine that you'd be at least couple hundred rpm higher than what I'm running if you're using 4.56's (assuming you'll have a high stall converter).

 

[Bad Sport]

We're probably going to be in the 3200 range, 9 1/2" converter.

I'm just curious how it will perform with the gear swaps, going from 3.55 on the street to 4.56 for the strip. He says, with confidence, he can build me one.

Then again, if I can live with 3000 on the street, I might just stay in the 4.56. I don't really journey too far from home with it.

 

[clinteg]

Yeah what you can tolerate on the street is going to differ from the next guy for sure. To me, 4.56 with 26" tires on the street is going to see a lot of revs. Unless you're just cruising around 40 mph roads then it probably wouldn't be a big deal. If you're hitting any highways, I'd expect some high rpms which may or may not be tolerable to you. For the track with 28" tires, I'd expect that they would work well, although they might be on the tall side? I don't know a whole lot about your setup other than your sig. Have you had it down the track before?

 

[Bad Sport]

But I'm going to 28" tall.

And my set up will be completely different once I get my mill together.

 

[transman]

I did a quick check at Randy's Ring and Pinion.
For what it's worth, their calculator says that your engine rpm at 60 MPH will be as follows:

with the 4:56 gear and a 26 inch tire: 3630

with the 4:56 gear and a 28 inch tire: 3371

with the 3:55 gear and a 26 inch tire: 2820 (which is the same as my Challenger with the same tire size and gear ratio).

When you change your engine over after it's finished, all this could be thrown out, including what stall your new engine combo will need. New engine, different specs for your converter. Don't blow your money or waste your time on a converter until you've got everything together.