Originally Posted by moparx
since i started this post, [and pretty much knew the answer going in] a dana was basically the answer i expected. i would not want to put in a 9" for several [of my own personal] reasons, although it would be a very viable alternative.
the car now has 3.91's in it with a 29x12.50 tire, and goes down the road nicely at 3000-3200rpm.
with that said, and moving to a dana, what gear should i look at to use ? 3.73, 4.10, 4.30 ?
maybe just sell the transbrake 727 and go 4.56 with an A518 ?
it's always mission creep, ain't it ? biggrin
beer


You won't find any new pro gears for 4:10 (series 1 carrier) and lower ratios for a Dana. We're still carrying the fronts past the 60ft with 3.73 ratio but they are the hard, brittle street gears. I'll be checking them every season for cracks. The cross over ratio for the carrier is 4:10 make sure you have the correct one.
The 4:10 street gears and down, use a thick ring and they wont work with a series 2 carrier.
You can use a series 1 carrier and a spacer for the pro gears.
( I think I got that right now grin )

Last edited by Tig; 12/05/22 03:43 PM.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03