o stock wagon gear question
 

were building a 71 torino wagon with a 351c (4v) engine for o/sa and need a little advise for rear end gear selection. im thinking a 5.60 ratio. what do you guys think...any advise would be appreciated

Re: o stock wagon gear question
 

What's the total weight of the car/driver on the track? What's your finish line RPM target? What's the low gear ratio in the transmission?

Re: o stock wagon gear question
 

Sounds a bit steep for a hydralic lifter stocker engine, Maybe alright for 1/8 mile. How much will that car need to weigh to make class? Stick or Automatic?

Re: o stock wagon gear question
 

Our O/SA runs 488 gears in good air and 513 at Elevation or Heat.
It runs a pretty high winding 318 Small Block Mopar but 351 may
like Slightly more gear.

O/SA National Recorder Holders

Re: o stock wagon gear question
 

I dont know what gear it needs but keep in mind your better off under gearing a car than over gearing. Start a little conservative and once you get everything ironed out, try different gears.
You'll kill a lot of ET if you over gear but if you're close on the conservative side, you won't be that far off on ET

Re: o stock wagon gear question
 

I know of at least 1 higher class 351 running 5.40 gears, so you may not be too far off with
your guess of 5.60.

Re: o stock wagon gear question
 

thanks for the responses, heres a little more info
the car will weigh 4050 lbs it will have a 351 c (4v) with a hp rating of 300
can for this motor is .420/.450 lift it will have a c4 trans (not sure of tranny gearing yet) looking at a 5000 stall convertor and it will run 1/4 mile
just want to get it out of the hole but not lay over at the top.


thanks kevin

Re: o stock wagon gear question
 

Just to make sure we're on the same page, I see a 1971 Torino SW with a 351C-4V that is factory rated @ 285 HP. Is that the engine you are going to run? Then it is 305 NHRA rated HP, not 300 HP.
Also the specs are a .430"I / .450"E cam, Not .420" / .450".

After looking at what GTXJohn said about gearing (he runs SBM which would have a lot more bottom end than your Clevland), I would start with 5.38's. And you might be right on about the 5.57's.

I believe Pro-Trans will build a TF inside a C4 with better low gearing. Of course that isn't cheap!

For a wagon, I think those are pretty cool. Not Vista Cruiser cool, but I think next best thing.

Re: o stock wagon gear question
 

The 4V will not run O/SA The Squire (the heaviest) has a 13.01 weight break with a rating of 305HP it is a natural K/SA.The 2V in the Squire has a weight break of 16.16 and a HP rating of 240 it is a natural P/SA

Re: o stock wagon gear question
 

With my 255hp I run 5.86 @ 4400lbs in O/SA.