Smoothest 4/5 speed for GM 350? -
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Unread 08-25-2015, 02:37 AM   #1
Registered User
Join Date: Aug 2015
Location: San Antonio, TX
Posts: 9
Smoothest 4/5 speed for GM 350?

I've got an 87 YJ with a GM 350 and a TH350 transmission. Thing is, I hate having an auto in my "fun ride", and I'm looking to switch back to a four or five speed manual. What would be a smooth-shifting, relatively cheap and easy option?

The AX-15?

FWIW, it'll be on paved streets 99% of the time, so I don't need anything crazy or incorporating granny gears.

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Unread 08-25-2015, 06:11 AM   #2
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1987 YJ Wrangler 
Join Date: Feb 2009
Location: Jacksonville, Florida
Posts: 1,076
For smooth you can go with the medium duty NV3500. It shifts very nice and has good ratios for street driving. If you want something more beefy then the NV4500. I have had both. I love my 4500 for the granny gear and strength, but the 3500 shifted much nicer. The 4 speeds out there will shift like the 4500. You can find SM465's super cheap but its basically a 3 speed on the road due to the granny low. Note that all of these have a 32 spline output. You will need a matching input on your transfer case. Also they have a 6 bolt pattern. You will need to run a chevy transfer case. I run a NP241C transfer case.

1 4.02
2 2.32
3 1.40
4 1.00
5 0.73
R 3.55

NV4500 MT8 variant
1 6.34 (1993) 5.61 (1994 on)
2 3.44
3 1.71
4 1.00
5 0.73
R 6.34 (1993) 5.61 (1994 on)

NV4500 MW3 variant
1 5.61
2 3.04
3 1.67
4 1.00
5 0.73
R 5.61 (to 1997) 5.04 (1997 on)

First Gear - 6.55:1
Second Gear - 3.58:1
Third Gear - 1.70:1 -Sometimes incorrectly listed as 1.57:1.
Fourth Gear - 1.00:1
Reverse - 6.09:1

Related info.
87 YJ, 350 TPI, NV4500, 35x12.50x17, SOA, Locked front, 8.8 LSD rear, Flat skid
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