what gears in your y block truck?

[abe]

I have the original 3.92 rear end with a 3 speed column shift. Works fine for me. Winds out a little bit on the highway, of course.

[pintoplumber]

I think the overdrive is .70 Dennis

[bigwin56f100]

Hey Dennis,

I see the Dennis Carpenter sells 4.27 ratio ring and pinions NOS for $350.00

Kevin Bigwin

[pintoplumber]

Kevin, I saw that in the catalog the other year, but I thought it was for the 48-53 trucks. I'm only turning 3800 at the finish line. Dennis

[bigwin56f100]

Thats why we are so slow, we need to be turning 5,000 RPM's PLUS at the finish. I'm lucky if I'm at 4200 at the finish.

I would like 4.80 in the race truck or there abouts.

Kevin Bigwin

[pintoplumber]

I don't Kevin, is our problem gearing or horsepower? Merry Christmas Dennis

[bigwin56f100]

I think its a combination of several items combined.

Gearing, we need to get the RPM's up at the finish line

Ratio spread, The 3 speeds we use have to wide of a ratio spread, thats wyh the 5 speed guys do so well.

Horse Power, You do realy well for the cubes you are running, me on the other hand, I have some parts combinations that dont work well together, thus lowereing my HP

Kevin Bigwin

[slaidman]

Hi! This is a late response. 56 F100 with stock 272, 3 speed and Dana 44. Swapped out 3.93 for 3.23's with a 27" tall tire. Much nicer to drive on the open road since not spinning as much. Much smoother. And still pulls third in town no problem. Not a lot of miles on it yet but very please with the choice right now.

[indianajo]

I've got the original 3.56 ratio in the rear of my 9 pass '59 station wagon (yeah, you may not be interested) with 25" tires and a 272 y block v8. Had originally a fordomatic/3, started in 1.4:1 second unless manually shifted into low. 14 mpg. Changed to a Clark 251VO 5 speed, 11" clutch, 6.0 first, .78 o/d, loved that setup but it wore out quickly. Started it in 2nd, drove mostly in middle 3 gears, the engine wouldn't pull o/d on the flat, but the slightest downgrade let me save gas. I really liked the 4-5 shifting, it kept me awake back when we were all driving 55. After the Clark, put in a T98, use 2-3-4, granny is for towing (anything, I once pull started a 30' dodge 600 moving van, loaded) or off road. Will go 88 mph when the front end starts lifting and I back off. 14 mpg still, faster acceleration than fordomatic 3. I think ford originally gave the vehicles such high rear axle ratios because fouling and misfiring were such problems in the 50's, you often drove with a dead cylinder or two if you weren't a mechanic yourself. Pertronix coil and bigger spark gap and 8mm silicon wires really nails that problem.

[HT32BSX115]

Howdy all!

Mine was a 239 Y, T-98 and a Timken 6.80:1 rear axle.


Now it's gonna be a 292, Eaton 2 speed (5.83/8.11:1) axle and an E4OD (0.71:1 OD)


With 40" tires I expect about 2100 RPM at 60 mph in OD with the torque converter locked.



Cheers,


Rick

[MP&C]

8.50:1 tandem Rockwells. 45 mph downhill with a tail wind about lets it out.

[e william]

239-y .030\over, '64 ford 3-spd, dana 44\3.92 rear gear. I like it.

[booneyrat75]

I originally had the T-98 with 4.56's out back in my '64 F-250 2wd but the insane rpms on the highway killed me. I switched out the trans for a 3.03 3spd and a set of 3.54's out back. I love the combination but recently came to own a World Class T-5 I'm thinking about putting behind the new engine. The engine is a 292 punched out to 309 with forged internals and nitrous. I don't know if the T-5 can handle the power but I can always go back to the 3spd. Any thoughts?

[Rusty_S]

Not a truck but I plan on keeping the 3.22:1 rear axle ratio as well as the old 3spd auto.

Top speed should be in the neighborhood of 120 (got orignal articles printed in 56 where people who owned the 56`s talked bout them and lots of them said that they handle great up to 120 mph and he is usually on the highway doing 100 to 110.

Would like to install a od unit after the transmisson to drop the rear axle ratio down some so I wouldnt be at 3,000 rpm at 85 mph but I guess if I get on the freeway I can just do the posted speedlimit of 65 and that would put me at the ideal 2500 rpm mark.

[charliemccraney]

Z spec T5, 2.95, 1.94, 1.34, 1.00, .63. As far as I know, it's the stock 3.70 out back. My engine doesn't seem to like the overdrive ratio; I get the same mileage in 4th as 5th, at the same speed. Gotta find out what's going on there.