Running a 383 SBC rated around 425 - 450hp, 700R4 trans. What converter and stall are you finding to be the best for these cars?
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Running a 383 SBC rated around 425 - 450hp, 700R4 trans. What converter and stall are you finding to be the best for these cars?
FFR racing suggests about a 3000 to 3400 stall speed so you don't have to fight the brake pedal at stops, but some say that's a little high. The light weight of the car requires a higher stall speed than a normal vehicle. Mine is a TKX so I can't say personally.
33 Hot Rod Stage 1, Gen.2 ordered 11/11/2021 started June 12, 2022, LS3 E-Rod crate engine, Tremec TKX, 8.8 WITH 3.55 Ratio and limited slip with 31 spline axles.17X8 and18x10 Race Star wheels wrapped in Conti Extreme contact DWS tires, Mustang Cobra brakes all around. Electric PS and AC. Hard top, electric windows and bike fenders. First Start 5/31/2023. Go-Kart 6/2/2023.
Also your cam specs come into play, as well as intake manifold (dual- vs single-plane), and rear gears.
-- Mike -- TxMike64 -- @TxMGarage
Gen1.5 Hot Rod '33 #1094 (Stage 1) - 302/AOD '15 IRS - Quad Built - Build Thread
FFR suggested 3200 - 3400 RPM for my truck build. Which Gearstar Performance said they put into the GM 4L65E transmission they did for me. I have a 430 HP LS3 crate motor. Not legal or on the road yet. But I've driven it probably 10-20 miles around my neighborhood and it's just fine. When idling and in gear, easy to hold with the brakes.
Build 1: Mk3 Roadster #5125. Sold 11/08/2014. Build 2: Mk4 Roadster #7750. Sold 04/10/2017. Build Thread
Build 3: Mk4 Roadster 20th Anniversary #8674. Sold 09/07/2020. Build Thread and Video. Build 4: Gen 3 Type 65 Coupe #59. Gen 3 Coyote. Legal 03/04/2020. Build Thread and Video
Build 5: 35 Hot Rod Truck #138. LS3 and 4L65E auto. Rcvd 01/05/2021. Legal 04/20/2023. Build Thread. Sold 11/9/2023.
I'm sure a (11" or 10" Converter / 2,500-3,000 RPM Stall) but better advice is available.
1. Often time manufacturers can really dial in a combo.
2. Have you considered reaching out to Hughes or TCI?
3. Total Weight, Cam & Engine Specs, Intended Use, Plus Gearing Is All They Need!
https://www.hughesperformance.com/perf-conv-2/
https://www.tciauto.com/contact-us
Good Luck & Happy Converter Shopping!
Last edited by GoDadGo; 03-22-2023 at 07:13 AM.
I have the same engine/tranny as edwardb in my Hotrod. I followed FFR recommendation to use a 3000-3400 stall converter, it works just fine.
On a level surface I hardly have to touch the stop pedal to hold the car. With my foot off the brake the car will slowly creep ahead.
I used the 298mm converter that GM specified for the 4L70e tranny.
'33 Hotrod, #1047 Gen 1, delivered on 2/27/18, go cart on 9/24/18.
LS3 w/Gearstar Level 3 4L65e Tranny, Yank converter, Lokar shifter, Electric PS, Vintage AC/Heat/Def, 8.8" 3.55
TorqThrust II Wheels w/Toyo Proxy T1 Sport Tires, F 235/45ZR17 R 295/35ZR18
Garage Built, Driveway Painted.