gearing and posiing my rear end

what do i need and what kind of speed will i accomplish with 370 gears or so?
its going to be pushed by a 89 high output with alumnum heads and aftermarket cam, c4 trans

was wondering what i will need and if anyone knows if theres a kit i can just buy to put it together and go

 

i want 3.80 gears with my t-5 5_speed trans

and don't forget the tire size makes a difference

 

You can use this to figure out MPH vs RPM: http://home.netcom.com/~sgalaba/mph.htm

Im not sure the exact ratios of a C4, but I'm sure PaulS or the internet can answer that one. Assuming you have a factory 8" rearend, the available aftermarket rear end ratios for an 8" Ford are 3.00, 3.25, 3.55, 3.80, 4.11 and 4.62. There might be some "special" ratios out there, but these are the ones that are readily available.

If you want a drop in tracloc unit (posi) with gears, Bryant on this forum sells/builds those. Or you can look on eBay.

If you want a highway driver with your C4, I would go 3.55 since you do not have overdrive. If aren't planning on doing much on the highway, or are planning on drag racing, you might want 3.80s, or even as low as 4.11s if you are running slicks. Have fun!

 

C4 3rd gear...1:1

...Height of tire
...RPM range of cam
...TQ stall
...rear gear ratio

all of these should match...so you need to make a call on what you want to do with the car...Street...Strip or Street/Strip...

 

Bryant on this board is pretty good with that stuff. Send him a message or maybe he'll add his input. I was cruising on the freeway close to 3,000rpm with just 3.25 gears. So is this going to be a daily driver or a racer?

 

the info offered so far has been good.
you will need to know your tire hight to figure out the relationship between speed and rpm in your car heres a few links to sights that can help you out.
http://users.erols.com/srweiss/index.html
that has lots of usefull calulators to figure different info.
http://www.chrismans.com/Calculators.html
this page is good also to help figure out what you need.

where in cali are you?

 

Cool, i want this thing to haul @ss! daily driver but bad on gas lol
i have 16" rims with 205 / 60's in the rear and small in the front
Im from Visalia 559 area you?
mainly a street/strip machine

 

im in san diego 619 area. if your up to a road trip you can come down to my shop to get it all done.

 

posiing .

 

sacramento ! 916 !

 

Former 916er (El Dorado Hills), current 559er (Hanford) here. My plan, once I rebuild my cash stores, is to head back down to San Diego and visit Bryants shop as I've heard nothing but good things about his work. Hey Bryant, how much for the posi 3.55 rear end on a 73 Maverick? would you recommend overhauling the tranny too?

 

if you have an 8" rear they sell third members with posi and gears on ebay...newly rebuilt and i think u can pick what gear u want...check it out

i think there like 600-800 bucks

 

they have some on ebay from high 400's and thats what i probably will do with my 9'' housing but i ask'd around and got some good and some bad info ??