Will a Gyromatic handle a rear axle ratio change?

[James_Douglas]

On my 4800 pound '46 Desoto Suburban I have used both the 4.11 gears and the 3.9 Gears.  I have also used the M5 and the 3-speed with BW Overdrive.  Today I am running the 3.9 and the 3-speed with BW Overdrive AND the fluid coupling.

 

In my '49 CV I have the M6 and the 3.9 gears.  I run it at 65-70 without any issue.  It is "buzzy" however at 70.  If I was going to drive it a lot, I would put in an overdrive.

 

Attached is some excel work I did with the gears like 10 or more years back.  I did not check it before I posted it below, but it should be correct. If gives you an idea on the gears.

 

James.

 

 

 

[mopar_earl]

On my 4800 pound '46 Desoto Suburban I have used both the 4.11 gears and the 3.9 Gears. I have also used the M5 and the 3-speed with BW Overdrive. Today I am running the 3.9 and the 3-speed with BW Overdrive AND the fluid coupling.

In my '49 CV I have the M6 and the 3.9 gears. I run it at 65-70 without any issue. It is "buzzy" however at 70. If I was going to drive it a lot, I would put in an overdrive.

Attached is some excel work I did with the gears like 10 or more years back. I did not check it before I posted it below, but it should be correct. If gives you an idea on the gears.

James.

Thanks for the info! I have added a 3.55 explorer axle swap to my list. Unless I come across an OD trans, than a 4.11 explorer axle. Lol love my gyro, just wish it had OD! Love not shifting and clutching. It's great in town traffic. After driving all manual vehicles for 20 years, a fellow gets tired of shifting gears. Especially in my 6spd diesel Ram in traffic.

Earl

[CoronetGuy]

Anything ever happen with this? I too have a 52 coronet with the M6 gyromatic, not sure what my gear ratio is. I am debating swapping in a different rear end. I've read that most explorer 8.8 axles have 3.73 gear. Some have 3.55 or 4.10. The 4.10 is found in eddie bauer edition explorers

[mopar_earl]

No I haven't done the swap yet nor got the axle needed. You car should have 3.90's but best to check as the car could of been ordered with different gears or been changed.

Earl