conversion question

[Justblazin]

So this thread will sound like the 100's of other threads on this forum. But had to post. So sorry in advance. So I have a 1992 Gmc sierra 1500. 4.3l/5-speed(i think the 4500 trans). I want to have a fun toy and be able to tow my Syclone as well. I live in California so i must keep the smog stuff. I have been reading through the board and have noticed that almost everyone who is or has done the conversion is keeping a 4l60. I got my hands on a 03 lq9 out of a escalade, and have access to a 02 5.3 out of a yukon. I have a couple of simple questions, which i couldn't find any answers to.

1. Does the 5-speed mate to any of these engines? or Do i need to use a 4l60 or T5 or t56?
2. How or will my stock gauges work?

I kind of got the basics on the fuel plumbing. I have an extra 255l/hr pump. I want to stick with the 5speed or go with a 6speed. But might be restricted on the founds if i have to buy a trans. As i already have 2 4l60's in my garage.
3. Can i get a harness made for a 4l60 and then swap to a t56?

Anyone got a link to a post or thread that goes into details on a similar swap. I know Allen at nelsonperformance.com started to gather up info but didn't complete the thread.

Any help would be greatly appreciated.

-Fred-

[RedHeartbeat]

http://forum.ls1truck.com/index.php?showtopic=9772

link for conversion

As for the 5 speed, you'll puke it's guts out in no time with the GenIII engine. The 92 5 speed was a piece of crap behind a puny 6 cylinder engine. Double the TQ/HP and it will fail shortly. I'd switch to a 5 or 6 speed from a late model V8 vehicle.

[Justblazin]

<div class='quotetop'>QUOTE(RedHeartbeat &#064; Feb 22 2007, 10&#58;21 AM) [snapback]84116[/snapback]</div>

http://forum.ls1truck.com/index.php?showtopic=9772

link for conversion

As for the 5 speed, you&#39;ll puke it&#39;s guts out in no time with the GenIII engine. The 92 5 speed was a piece of crap behind a puny 6 cylinder engine. Double the TQ/HP and it will fail shortly. I&#39;d switch to a 5 or 6 speed from a late model V8 vehicle.
[/b]

Ok, i will mainly be using the truck to tow. Should i use a 5speed from a 2000 silverado with a 4.8. or go with the 4l60 or 4l80?

the 6.0 is stock with a zo6 cam and intake manifold.

Thanks.
fred

[RedHeartbeat]

4L80E would be my choice. Once you mention that you want to use the truck primarily to tow a trailer with a 4000 lb or so load on it, there is no better transmission than the 80e for that application. You could get away with a manual transmission but I&#39;d rather be focusing on driving than shifting gears and it&#39;s easy to get anybody behind the wheel of a vehicle with an automatic transmission.

[80K25]

Your 92 should have an NV3500. As mentioned by redheartbeat, they arn&#39;t exactly the toughest transmissions around. They&#39;ll barely stand up to a bone stock TBI 350, forget a Gen III.

If you want to keep the standard, you should find an actual NV4500, which are found in 3/4 ton and 1 ton trucks 92ish through 99. From 92ish - 94 they had a granny first gear similar to the old SM465s so you rarely if ever use 1st, and always start in 2nd. In 95 they switched over to a true 5 speed, where you start off in 1st, and have a slightly taller geared transmission.

I understand a guy needs a special spacer to bolt an LS1 flexplate on, but that the LS1 flexplate can be used with the stock clutch for the 10 spline input on the NV4500. I&#39;m not entirely sure what is associated with getting a pilot bearing in, prehaps its in the spacer. Otherwise the bellhousing should bolt straight up, and you should be able to use your stock hydro clutch lines with the NV4500.

When you buy the NV4500, get it&#39;s transfercase too, if it is the same as your current one, they will be different spline counts.

[Justblazin]

I am 2wd.
I am thinking of using my 4l60e that i have, to save some few &#036;&#036;&#036;. Then do the 4l80e swap, when the founds become available.

What do you guys say?

[80K25]

The 4l60e should hold up just fine, easy enough to make the swap to a T56 or something instead of a 4l80e if your heart is really set on a standard

[Justblazin]

The 460e came out of my 93 s10. truck had 50k miles before i wrecked it. It is a one piece case. I have noticed that the newer 4l60e&#39;s have a 2 piece case. Will my 4l60e still work?

Also, what will i have to change on the harness to convert to the 4l80e later down the road? or even the t56?

i am picking up my 6.0 tomorrow out of a 03 escalade.

[80K25]

Ah, that 4l60e will not last very long... Missed the part earlier in the thread where it comes from a V6 truck. They used lighter bands and frictions than the V8 versions, and I think also had different gearing.

Setting up the 4l80e would be a tad bit more challenging on the wiring side, as it has an additional sensor that detects the pump speed or something like that, and would require you to put the 4l80e connector on as well, which does involve some re-pinning.

Setting up the T56 would be easier, it will have the same VSS as your 4l60e, but they are really long transmissions, and the shifter may wind up between your two seats, instead of infront of them forcing you to go to buckets if you do not already have them.

NV4500 is a good transmission as well, shifts nice and smoothly, and even came stock in your body style of truck. Only problem is that they are more of a heavy duty transmission, and you can not shift them nearly as quick as a T56, nor do they have as good of gearing for daily driving, more for towing. NV4500 also has the same VSS as a 4l60e.

Of course, no matter which way you go, you&#39;ll have to at least change the connector for the VSS, figure out how to mount each transmission, get a driveshaft made, and also get the prom changed to match.

[88s10]

The gen III pcm will not control a 93 4l60e. According to s&p that trans has a 12 pin connector and in 95 gm switched to a 13 pin and that’s the first year that the newer pcm can control.