gm nv4500

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south456

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eagle id
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trace
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1985
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k20
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5.7
hey guys i have been considering putting a 90s nv4500 in my 1985 square so it will have overdrive and i can actually drive it on the freeway, has anyone done this and can shed some light on how difficult it is actually going to be. i know i will have to get a adapter to put my np205 on the back of it and i know the frogger arm is on the passenger side not the drivers but what else will there be?
 

SquareRoot

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First things first. What trans and t-case do you currently have? I know someone who is familiar with this swap.
 

SquareRoot

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Is the truck currently using the 465? Just clarifying if the truck originally had a manual or auto. Since K20's didn't come with a 205 in 85 I'll assume it's not original either. Is the 205 the figure 8 or round pattern version? There's a reason I'm asking these questions, hang with me.
 

85K304SPD

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Following... My '85 K30 has 465/205. Overdrive would be awesome!!
 

south456

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Is the truck currently using the 465? Just clarifying if the truck originally had a manual or auto. Since K20's didn't come with a 205 in 85 I'll assume it's not original either. Is the 205 the figure 8 or round pattern version? There's a reason I'm asking these questions, hang with me.
The truck currently has a 465 it was stock manual and i swapped in a 205
 

SquareRoot

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Good news is your 90% there. You need the correct bell housing. You can modify yours or buy the Advance Adapter one. Your existing member will work. Mine bolted into the same holes on the frame. You need a 4500 specific trans mount. You will need a shifter and bracket of some sort to work the t case. Now's a perfect time to swap it to a twin shift setup. ORD and others have shifters and brackets specifically for this application. Also, put a fixed yoke on the output shaft and get the shaft adjusted if needed. It will need a slip joint put in it regardless. I love my setup. It's worth the effort.
 

south456

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eagle id
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trace
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1985
Truck Model
k20
Engine Size
5.7
Good news is your 90% there. You need the correct bell housing. You can modify yours or buy the Advance Adapter one. Your existing member will work. Mine bolted into the same holes on the frame. You need a 4500 specific trans mount. You will need a shifter and bracket of some sort to work the t case. Now's a perfect time to swap it to a twin shift setup. ORD and others have shifters and brackets specifically for this application. Also, put a fixed yoke on the output shaft and get the shaft adjusted if needed. It will need a slip joint put in it regardless. I love my setup. It's worth the effort.
Cool! Thank you for your help.
 

Jester67

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Chevy
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1985
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K10
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302
I don't want to hijack this, but would it be the same if you had a 208 Tcase?
 

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