Deere 8th 4020 June 05, 2023 04:08PM
What kinda hp does it take to run 8th gear in a 4020 get down in the end spin tires. 466 with a 2.6 turbo 20.8 under it. can switch to 18.4, limited rpm
3000

Re: Deere 8th 4020 June 05, 2023 10:15PM
I don’t think transmission is going to take it

Re: Deere 8th 4020 June 06, 2023 02:05AM
Been there done that, need 800-1000 hp to run road gear.
If you can run road gear you have enough to break the trans. Run at your own risk.

Re: Deere 8th 4020 June 06, 2023 06:25AM
I believe 8th gear is held onto the shaft by a single key. I have heard of people triple keying the shaft or welding it on to help it hold.

Re: Deere 8th 4020 June 06, 2023 06:33AM
The single to triple key will be the least of your worries.......you will wish you bought a proper 3 speed.



Edited 1 time(s). Last edit at 06/06/2023 06:34AM by FarmersFun.

Re: Deere 8th 4020 June 08, 2023 03:42PM
What is the weight? What type of tracks?

Re: Deere 8th 4020 June 12, 2023 11:53AM
Been there and done it. Depending on weight may only need 600 ho. You will take the teeth off 8th. Did it twice in a month before I put a atlas 3 speed in.

Re: Deere 8th 4020 June 13, 2023 03:15PM
I was spinning 18.4s with 4010 finals somewhere around 800, I never broke the syncro but I had a feeling it wasn’t liking

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