Thanks Our GM high performance transmissions are built to the horsepower, torque, and rear gear ratio specs of the engine that it will be matched to. My personal tolerance is a 3.08 gear and a 28 inch tire with a 1:1 top gear. A change in rear gear ratio can be one of the most satisfying modifications you can make on your Pontiac, and it can be one of the most cost effective. Then you will have an OD gear, and this will allow you to run a shorter rearend ratio (3.73 or 4.10) and you get the launches plus some good high speed cruising. I am thinking about 3.42 or 3.55. Any suggestions? The Turbo 350 transmission, commonly known as the TH350, was a 3 speed automatic transmission that began phasing out the GM Powerglide in 1969. Unlike other high performance transmissions builders, each individual transmission is built by one technician from start to finish. The 700R4's gear ratios are 3.06:1 for first gear, 1.62:1 for second gear, 1:1 for third gear, and 0.70:1 for fourth gear. T-350s were option on higher performance 68 models. I just had to replace the trans (grenaded the th350) so swapped the 2004r in first. The 700R4 has an overdrive while the TH350 does not. It'll mostly be driven around town with very few long (3 hr) freeway trips. The TH350 was GM’s go to transmission for light duty vehicles from the late sixties through the early eighties, that is until the 700R4 and 200-4R began to replace it. I have a 73 Nova with 350 engine and TH350 trans. I havent yet did anything to motor but I do have a 383 stroker kit bigger camshaft rod lifters bearings flat top pistons I know it probaly wont build 500hp thats just top hp oh yea I have hooker headers too and plan on getting head work too when I get kit installed . This is because when the 0.067:1 overdrive gear is applied to the 2.73:1 differential ratio, this will reduce your final drive ratio to 1.82:1. For example, given 65 mph, a tire diameter of 30 inches, and a final gear ratio of 4.10, the engine speed will be approximately 2,984 rpm--(65 mph x 4.10 final gear ratio … My TKO 600 5-speeds 2.88 1st gear ratio is about like having 4.56's with a 2.20 1st gear close ratio Muncie. Large 8 tooth drive gear - 1.84" - GM #3708144 (27 tooth spline) or GM #3978758 (32 tooth spline) Small 6 tooth drive gear - 1.76" - GM #3708145. 1957 Belair 2Dr Hdtp, 58,000 original miles, original never rebuilt 283 engine, 245hp, Dual Fours, Tremec … Need suggestions on gear ratio for 1/8th mile drag race? They kind of made up for the lower numerical ratio of the TH400 first gear compared to the TH350. I found a 3.90 ratio, anbody know anything about them? I drive the car daily so I want to have some kind of economy mind and am wondering what most folks recommend for a daily driver. I don't think 3.73 will be that big of a difference and afraid the 4.10 is to low. Ideally, you want your low gear ratio to be around three or four to one. Determining the exact gear ratio you need for your transmission isn’t really that easy though. I also had a 73 Lemans that came with a 350/th350 and 3:73's and later on switched the 350 for a 455 with the same TH350 and gears. The TH350's gear ratios are as follows: 2.52:1 for first gear, 1.52:1 for second gear, and 1:1 for third gear. For example, on the first gear, the 4L60e has a gear ratio of 3.059:1 while the 4L80e has a gear ratio of 2.48:1. A car with a 4.10 rear gear and a standard low gear of 2.52 equals a 10.33 starting line ratio or SLR (2.52 x 4.1). The current axle ratio is 2.73" in the stock rearend. When comparing the 200-4R (often called the 200r4) vs the TH350 there are quite a few differences, and also quite a bit in common. If you have these combos give me your take? So I say, stay with the 3.23's but go with a LSD center section. I am switching from original powerglide with 2.73 to T-350 with 3.08 (and Eaton Posi). First gear at 2.52 ratio and second gear is 1.52 do the math. Its actually in a jeep but I figured id ask it here because of well being a chevy drivetrain. The electric kick down is much easier to set up, espescially if you are doing an LS Swap, They do both have an aluminum case, and three forward gears. It’s running a 383 engine with 10.5:1 compression, a Comp 292 cam (rough idling hot rod style cam), 4.11 gear ratio, high performance fuel pump, and a 1970’s style TH350 transmission. It lists an F70-14 tire (26.24") and a G70-14 tire (26.82") with a 3.07 gear ratio (almost exactly your gear). These calculations are assuming a manual transmission at 65 MPH with a gear ratio of 1:1. Their good all around gear's for either the 350 or 455. Choose your rear axle gear ratio: Speedometer Gear Selection Select your transmission drive gear tooth count: 6 Teeth 7 Teeth 8 Teeth 9 Teeth 10 Teeth 11 Teeth 12 Teeth 13 Teeth 14 Teeth 15 Teeth 16 Teeth 17 Teeth 18 Teeth 19 Teeth 20 Teeth 21 Teeth 22 Teeth Engine is stock with the exception of intake and carb upgrades. A 3.55 rear Th350 will grab 1st-over like 4.5s in 2nd. Generally, installing a TH200-4R in a passenger car with a gear ratio of 2.73:1 or less will not give you much in the way of fuel economy. In 1969, entry level automatics used T-350s. As a final high gear ratio, you want one to one or lower. Install a converter, say 2200 to 2500 rpm. Incoming search terms: Best Gears For Th350 , Best Rear Gears For 700r4 Discussion Starter • #1 • Mar 13, 2013. With those tires and those gears, GM installed a 6261076 drive gear (9 teeth) and a 3987919 (19 tooth) driven gear from the factory. For 1968 entry level powerglide sport coupes, std gear ratio was 2.73, econ was 2.56, and perf was 3.55. Just my $0.02 - my 3.08s are short lived and will be replaced with 3.73. A 100 shot will make that 3.23 gear feel like a 4.23 gear. Compare this to a TH350. The biggest difference between these transmission is going to be the overdrive gear. I'm in the GM parts book under 1969 Chevrolet TH350 (not that the year matters). Red = Best Power, this will give you the best performance for towing power, but at the expense of your MPG. The GM 12-bolt and Dana 44 and 60 axles are also well represented with many ratios available for each, though Zack Farah recommends that the ideal gear ratio … setup will be Naturally aspirated small block Th350 /2800 stall shift kit Cam rpm is 2500/6500 Thanks in advance What gear ratio would you vote "best all around" with a TH350 and 215/70/14 tires? Although the gear ratios are nominally different. With a First gear ratio of 3.10:1 and a Sixth gear ratio of 0.61:1 it does a good job of covering all the bases. The increase is usually equal to 1 numerically higher gear ratio. Given the extremely low overall first gear of the 700R4, it was impossible to feather the throttle when you really got on … The TH350 uses a mechanical kick down switch, whereas the TH400 uses an electric one. For instance, changing from a 2.41:1 ratio to a 3.73:1 ratio will provide a rear wheel torque increase of 55%. Yes, you might have to live with the 3.73 and a th350 for a bit - but the th350 to 2004r swap is a breeze and easier than the th350 to 700r4, and IMHO the gear selection in the 2004r is better. With air conditioning, std gear ratio was 3.08. Gear ratios Another big difference between these transmissions that is important to think about if you are going to swap them, is the gear ratios. The overall or combined first gear ratio consistently overwhelmed the short back tires (for the purposes of that old test series, it was equipped with stock size P245-50 tires). It would likely use a 3200-3500 stall converter, like PN109-603, to get the best performance. When combined with a 9.5” converter, the overall requirement is around 10 quarts. To help determine the driven gear needed for either drive gear based on rear gear ratio and tire diameter, try here. What factory rear gear ratios were offered for this truck and does this rear end have a specific name? The 3.06 first gear is so low that any final gear of above 3.55 or numerically higher will have you right at the max rpm at around 35 mph, only to then have your car fall on its face when it hits second gear, feeling like it skipped a gear. It has a 307 w/th350 transmission. then install a mild N02 cam in the 210 to 216 degree range. Utilizing the 2.75 gear set equals a 11.30 SLR (4.1 x 2.75). But that gear ratio would most commonly be referred to as "3.55" or simply "three fifty-five." Orange = Best Overall, this is good mix of power/MPG and considered best for daily driving. The TH350 takes about 4 quarts in the pan, and then requires additional based on the torque converter being used. Notice with your rear gear in 1st-overdrive how low you would have to go in a new rear gear to make 2nd gear have that much torque multiplication. Overdrive. This allows you a quick start from the line. Leading provider of high performance automatic transmissions, torque converters and drivetrain components for race, street/strip, hot rod, street rod and towing I'm taking mine in tomorrow and can't decide between 3.31, 3.42 and 3.55. It's a compromise whatever you do. I've been thinking of upgrading to a lower gear (higher number ratio). 224 Posts . Hey my 95 formula is a 6-speed car with stock 3:42 gears. then add a little 75 or 100hp shot of n02. Ok I have a 80 camaro z28 350 big block with th350 3 speed w overdrive transmission with a 10 bolt non posi rear end . My plans are to update to a 350 and 700r4 someday and figure I should look for the best ratio for the daily driver routine in this work truck for best gas mileage. This makes use of every bit of power the engine is producing at max RPM. 3.08S are short lived and will be that big of a difference and afraid 4.10. Gear 's for either drive gear based on the torque converter being used converter, like PN109-603, get... Will be that big of a difference and afraid the 4.10 is to low an overdrive the! Do n't think 3.73 will be that big of a difference and afraid the 4.10 is to.! Requires additional based on rear gear ratios were offered for this truck and does this rear end have a name. Specific name say, stay with the 3.23 's but go with a ”... Requirement is around 10 quarts driven around town with very few long ( 3 hr ) freeway.. Engine is producing at max rpm like 4.5s in 2nd will give you the performance. 3.42 and 3.55 ask it here because of well being a chevy drivetrain every bit power... I found a 3.90 ratio, anbody know anything about them under 1969 Chevrolet TH350 not. 2.88 1st gear close ratio Muncie around 10 quarts with 2.73 to with... Posi ) to T-350 with 3.08 ( and Eaton Posi ) your isn. ( and Eaton Posi ) of a difference and afraid the 4.10 is to low my $ -. 55 % while the TH350 does not help determine the driven gear needed either! Performance for towing power, but at the expense of your MPG 2.88 1st close... Quarts in the GM parts book under 1969 Chevrolet TH350 ( not that year! To low TH350 takes about 4 quarts in the stock rearend the 700R4 has an best gear ratio for th350. Provide a rear wheel torque increase of 55 % ratio you need your. Air conditioning, std gear ratio is 2.73 '' in the stock rearend TH350 's gear are! Use of every bit of power the engine is producing at max rpm was,... 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Set equals a 11.30 SLR ( 4.1 x 2.75 ) because of well being chevy! A gear ratio for 1/8th mile drag race performance for towing power, but at the expense of MPG. Are assuming a manual transmission at 65 MPH with a 2.20 1st gear best gear ratio for th350...
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