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95 S_Trucker · 10-08-2018, 02:24 PM

You may be able to cruise better at highway speeds.

But forget about mileage. The best you will get is 8-9. I get 9-10 with 3.73, overdrive, and modern fuel injection.

Another option would be a different ratio in your rear diff. I assume you have 4.10 or 4.56 back there.

If you do decide on the 700R4, it would need built to last behind a big block.

You could also do a 4L80E with a stand alone controller.

10-08-2018, 02:24 PM	#2
95 S_Trucker Registered User Join Date: Oct 2009 Location: . Posts: 2,178	Re: 700r4 or TH400 with gear splitter? You may be able to cruise better at highway speeds. But forget about mileage. The best you will get is 8-9. I get 9-10 with 3.73, overdrive, and modern fuel injection. Another option would be a different ratio in your rear diff. I assume you have 4.10 or 4.56 back there. If you do decide on the 700R4, it would need built to last behind a big block. You could also do a 4L80E with a stand alone controller.