So what’s the thinking on 915 gearbox kits for a/6 build these days Options

[Tdskip]

I’ve had a chance to go through some very useful past discussions, but as always win a couple years has gone by it’s worthwhile to revisit this topic The latest thinking and experiences. Looks like there’s a trade off between buying a pre-packaged kit versus trying to roll it all yourself, while expensive having someone else have done the brain damage does have a certain appeal to it.

Any thoughts or coaching out there on this?

I’m assuming if you go the route of a kit do you want to have the kit in hand when the gearbox servicing and flip is done, yes?

Thanks!

[old914dog]

I am with Dr. Evil.
I purchased his video and built a 901 behind a 3.2, 20.3 compression, Web 20/21 cam, headers, Chipped and never had a problem. It was not babied....but no Dairy Queen burnouts either. You can have 2 backups for the cost of a 915!!
But...I am a csob.

[Justinp71]

I am with Dr. Evil.
I purchased his video and built a 901 behind a 3.2, 20.3 compression, Web 20/21 cam, headers, Chipped and never had a problem. It was not babied....but no Dairy Queen burnouts either. You can have 2 backups for the cost of a 915!!
But...I am a csob.

Yes I have a similar setup. You just use 1st as a parking lot crawler, on the highway you scream at about 3500 but that's typical 914. I was reading on the track cars that the 901's only last so long, but if you upgrade the cooling you can get them to last longer. Heck the early 350 SBC guys used them with 1st removed.

A later model 915 probably suits a 3.2 better for general street driving gearing though.

I think a common late 70's 911 mod is to go back to the early R&P for more acceleration. But I think 1st gear in the 915 can take a better beating.

I have a mid-engine 915 sitting on the shelf waiting for a future install... Haven't decided what direction I want to go with it yet.

[Steve]

I am with Dr. Evil.
I purchased his video and built a 901 behind a 3.2, 20.3 compression, Web 20/21 cam, headers, Chipped and never had a problem. It was not babied....but no Dairy Queen burnouts either. You can have 2 backups for the cost of a 915!!
But...I am a csob.

Yes I have a similar setup. You just use 1st as a parking lot crawler, on the highway you scream at about 3500 but that's typical 914. I was reading on the track cars that the 901's only last so long, but if you upgrade the cooling you can get them to last longer. Heck the early 350 SBC guys used them with 1st removed.

A later 915 probably suits a 3.2 better for general street driving gearing though.

I think a common late 70's 911 mod is to go back to the early R&P for more acceleration. But I think 1st gear in the 915 can take a better beating.

I have a mid-engine 915 sitting on the shelf waiting for a future install... Haven't decided what direction I want to go with it yet.

(IMG:style_emoticons/default/agree.gif) A 901/914 trans is quicker than a 8:31 915. A 901 is weaker than a 915, but the 901 is quicker on the track or autocross due to the 7:31 RP. It's also nice having 2nd and 3rd in the same plane. But for street, freeway and road trips, the 8:31 915 is nice. You have 5 usable gears, your not shifting as much and with stock gears you are cruising at 80mph at 3200 RPM's. If I was younger and still liked to hot rod around, I would of kept the 914 gear box and maybe put a taller 5th in it.