Ring and pinion choice ?

Mossy68 · Post by **Mossy68** » Sat Mar 29, 14 9:52 pm

Am I right in thinking that a race type ring and pinion will be of a " softer", less brittle steel than that of a street application ?
And therefore not suitable for street use as it would wear quickly ?

Also would a 742 type pinion be only 1 type ( spline size etc ) ??

Thanks

Mick · Post by **Mick** » Sat Mar 29, 14 10:14 pm

741 and 2 are 10 spline, 489 is 29.

Pete · Post by **Pete** » Sat Mar 29, 14 10:16 pm

Yes, Race only gears are softer so they are not brittle but the downside is that they are supposed to wear more....so not great for street use.....a search on Summit Racing will give you a quick heads up on availability...

Mind you, we have a set of 3.91:1 gears for a Dana 60 and NOBODY makes that off the shelf, so you can get any custom gears if you wish........

Mossy68 · Post by **Mossy68** » Sat Mar 29, 14 10:19 pm

Thanks gents.

Pete. I take it having gears made is expensive ?

Pete · Post by **Pete** » Sat Mar 29, 14 10:32 pm

Mossy68 wrote:Pete. I take it having gears made is expensive ?

Don't know, but why would you bother? Plenty of choice out there. These came out of a Pro Mod back in the day where they had very specific needs. You need to balance the gear choice off against tyre height options...

Mossy68 · Post by **Mossy68** » Sat Mar 29, 14 10:40 pm

Pete wrote:
Mossy68 wrote:Pete. I take it having gears made is expensive ?
Don't know, but why would you bother? Plenty of choice out there. These came out of a Pro Mod back in the day where they had very specific needs. You need to balance the gear choice off against tyre height options...

Just wondered mate.
Sticking with stock tyre height to keep stock appearance so 3.55:1 should liven it up a bit.

autofetish · Post by **autofetish** » Sat Mar 29, 14 11:04 pm

3.55 seem to be the best street strip combo

Les Szabo · Post by **Les Szabo** » Mon Mar 31, 14 4:11 pm

Even 3.23's will liven it up from 2.76 Gary....3.55 may be a bit ott for that motor especially if your converters higher than stock stall?, that motor will probably be done by 4600rpm from the little I know of it.

Les

Dave-R · Post by **Dave-R** » Mon Mar 31, 14 4:17 pm

No nicer sound than a Mopar V8 cruising at 4000 rpm on the motorway.

Les Szabo · Post by **Les Szabo** » Mon Mar 31, 14 4:20 pm

Dave wrote:No nicer sound than a Mopar V8 cruising at 4000 rpm on the motorway.

Yep 4000rpm at 55mph in the Cuda with 4.30's..

.....wouldn't wanna do it for a 100mile stint though.

Les

Dave-R · Post by **Dave-R** » Mon Mar 31, 14 4:23 pm

4:30 gears in me Chally but with GV overdrive 4000rpm was 90mph.

250 mile stint each way for me.

Les Szabo · Post by **Les Szabo** » Mon Mar 31, 14 4:28 pm

Jeez, deep pockets needed for that run Dave.......fuel was only around .65p p/litre back then for me, went to Tony Dicksons in it....wasn't the most enjoyable trip.

Les

Dave-R · Post by **Dave-R** » Mon Mar 31, 14 4:38 pm

You are talking 4-5 tanks of fuel to get to SPR, few runs, and back.

I was getting 13mpg on the motorway from the six pack though.

Mossy68 · Post by **Mossy68** » Mon Mar 31, 14 6:39 pm

Stock convertor Les.
The only time I will be doing motorways really is to pod etc.
mostly be smoking round Essex.

GTXJim · Post by **GTXJim** » Mon Mar 31, 14 7:21 pm

I love cruising with my 4:30 gears, can't beat the drone of a big block