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800 rpm drop is HUGE.
My rpm at 70 mph used to be 3,100 with the 727. Switching to a TKX with a .81 O/D it dropped to about 2,400 rpm.
That 700 rpm drop makes a massive difference, to noise, mpg and mechanical wear. Heck, even 500 rpm is significant. Ask others who've done similar swaps e.g...
I went in my local tractor supply here in michigan last spring, the prices were through the roof, was gonna buy 8ft of chain length and 2 hooks would have been over a $100. looked at several other items similar increases. went to harbor freight up the road little to no change on anything. won't...
I know you want one relatively close to you. But there is a beautifully detailed complete axle assembly from a 63 Polara with tapered axles with a detailed painted carrier and black housing in Littleton, Colorado Facebook. (a must see) 8 3/4 3:23 sure grip new seals and good brakes with drums...
Confirmation helps, though.
Today at the junkyard, I looked at a few trucks/vans that had Hydroboost. I'm embarrassed but relieved at the same time. I found that in fact, I was plumbed backwards. I had pressure going in where it is supposed to be coming out. Here is proof:
This Chevy Astro had a...
I think the same can be said for first generation Chargers. Until recently you couldn't give them away! They have ridden the coattails of the second gens and increased in value somewhat. They have Imperial build quality and just don't get the love.
I switched from an A833 to a cast iron A833OD for a cross country trip, thinking I'd switch back after we returned home.
Nope.
It's great, inexpensive, kept my bench seat, no hacking the floor, direct swap to my bellhousing, shifter, driveshaft.
75mph @2,100rpm with 3.23s and a 28" tall tire.
You are correct. Still 800 rpm in my mind isn’t that much. GV advertises a .54 and .78. .54 would be more like what I would want that would put it at 2000. RPM at 70mph. But GV website doesn’t do a very good job of explaining the 4 different options they have. I also don’t like the idea of...
These shots are from my old highschool buddies engine shop in Smiths Falls, Ontario.
Tim was experimenting with lift, ratios and bending push rods in his Dart's 440 WAY back in the mid '70's and is still at it all these years later... less the push rod bending that is! Has his two Son's fully...
I think you've made a mistake in your calcs.
For 4.10 gears with a 26" tire I get 2,900 rpm at 70 mph with a .78 O/D, and 3,700rpm with a 1:1 ratio at the same mph.