Golfobsessed

that's been recommended by several transmission shops including BTO, no trans shop or supplier suggests i keep the 2600 stall with this car... all say drop down from the 2600, with my stock L48 configuration it was recommended a bit more than stock which is 1650 I believe, I wanted to step up a bit with a 2000 but not the 2600, I also don't want to install the 2600 and find I don't like it and pull the trans again.

I get mixed feedback but again don't want to install the 2600 to try it out.

Eric P

1650 rpm is stock stall speed in a T350 or T400 in a the later Vettes for sure , not sure on the early ones without looking at the book

Kevman72GT6

My cam is rated between 1600 and 5000 rpm for best performance, it's 108 LSA, 492 lift on exhaust and intake with a gritty duration.
With the 2k stall converter it'll be significantly better than the 1600 stall the trans is coming with.

Bikespace

I get that, and I don't really have a dog in this fight (no pun intended). But my one data point is this:

Stock 79 L48 (with a Lars-style tune, which helped a LOT), true dual exhaust, 3.55 rear, TH-350, 2.52 1st gear, stock converter, 1650 RPM stall = Dogshit
The car only woke up at about 3000 RPM, and then fell flat by 4500 RPM. YMMV with a better engine, or the ability to select gears*

For the OPs case, (3.55/3.08) * (1650/2000) = 0.95 Dogshit (95%, +Overdrive)

Perhaps a 5% improvement? Every testimonial I had read started at 2500 RPM for the TC, some over 3K. The guy who bought my TH-350 has a 3500 RPM TC to put on.

Again, don't take my word for it, there are lots of threads on this Forum and elsewhere.
https://www.corvetteforum.com/forums...ll-or-not.html
https://www.corvetteforum.com/forums...e-build-2.html

*(what has the ability to select gears, and has lockup in all 4, 5, or 6 gears, with no electronics?)

augiedoggy

I also have a 2004r and a 2000-2200rpm stall converter as recommended by the friend that built the trans for me. I have a 3.55 rear end to swap in because well thats what I found a deal on..
I have read quite a few threads on this swap and everything I read stated the TH400 was the same length as the 2004r and the th350 swap to a 2004r required a new driveshaft as the length was different.

I see the comment above stating the 350 is the same length as the 2004r and I question that because it does not align with what others who have done the swap say.. I have the th400 in my 74 so I had to source the correct yoke for the 2004r and have acquired the other bits and pieces.. I just need something to change in my life to allow me the free time to get this done.

and the 1st gear in the 2004r is lower than both the 350 or 400. From what ive read it should still be better with the 3.08 or in my case 3.55 than stock..

Golfobsessed

Hello again all, I have stuck with the 2000-2200 stall converter decision at the advice of almost every trans shop I talked with as well as Bowtie Overdrives with my stock L48, without the experience with the higher stall (2600) I don't want to just "try it" as I've stated this is not for performance but making it a little more drivable and I will be using the B&M controller.

I have been consistently told that I may get a little frustrated with the 2600 stall for normal driving with my set up as well as generate more heat and don't want that here in AZ.
the th350 and 2004R are about 2-3 millimeters difference in length (except long shaft th350) and the only difference is mounting location is several inches further back on the 2004R... I have a crossmember coming from Bowtie Overdrives, I have the new TV cable and bracket as well so gonna tackle it when I return from vacation.

augiedoggy

It seems I was wrong about the length difference of the 350vs 400 and was confusing my info with the longer 700r4 many use instead. its been a few years since I researched all this and started collecting parts. The fact that the th400 crossmember works fine for the 2004r had me mixed up further..

I was told the same thing in regards to a 2600rpm stall generating wasted energy as heat. My c3 is also a street cruiser so launches are not my priority... If they were id keep the stronger th400

Bikespace

I very much hope you have made the correct decision for your situation, and it all works out! Please let us know. The Arizona heat certainly adds a bit of complexity.

Golfobsessed

my thoughts exactly, most 79 and earlier crossmembers will work for the 2004r because you can remove the bracket and the 2004r bolts up to bracket mount, unfortunately the 80/81 doesn't have the removable bracket so I had to buy one

Golfobsessed

thanks bikespace and will do, gonna take my time on the project and add the Boregeson while it's up in the air, wanted to add it with the headers and pipes but needed to see the clearance first... might look for some advice here towards the end with setting trans pressure and TV cable, used to do it by hand with slack but gonna use a pressure gauge with this.

SH-60B

deleted

Kevman72GT6

Yes for a stock L48 I would agree, when I was working with Bullet cams, my cylinder head guy, and the guy doing the short block, they unanimously said to go with at least a 2000 stall.

For the weight of the car, and the cam specs I'm running with, and the rear gear (3.55) it made sense. Years ago we did a 460 BBF in a 4500lb Torino, and we needed at least a 3000rpm stall, but it was a strange car to drive. The vette is fairly light, and with a 1600 stall it would probably buck at stop lights.

TommyFox

My problem is the exhaust. Unless there is a way to make the current crossmember work with the 200 for now the problem is getting someone to build me a non emissions dual exhaust.

Golfobsessed

what year?

gjohnson

It will work,drivers side is tight .Since I have long tubes and duals straight back I went w/ www.bowtieoverdrives.com crossmember

TommyFox

1980

TommyFox

I have long tubes with a dual exhaust that runs along the passenger side with Flowmaster mufflers. Looks like one of thos bolt on kits altered to fit the headers . No cats. Sounds great but covered in surface rust.

My question is can the BowTie cross member or the other be used in place of the stock crossmember for now for the sake of getting a new 3"dual exhaust fabricated first or should I just stick with the exhaust I have for now and if so will it have any clearance issues with the new setup?
I don't want to do the swap and then have no exhaust to bolt on.

TommyFox

So basically buy a pigtail for a 200? Is the color coding for the wiring the same?

Eric P

The muffler shop can always install a couple Magna Flow universal catalytic converters if you are in an emission state . This hobby just keeps getting more expensive when ever you change a major component

Eric P

yes on the pig tail , not sure on the wire color