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GM Transmissions

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Ratio of drop between gears manual Muncie 4-speed
Transmission	1st	2nd	% Reduction	3rd	% Reduction	4th	% Reduction	Reverse
M20 (63-65)	2.56	1.91	25.39%	1.48	22.51%	1.00	32.43%	2.64
M20 (66>)	2.52	1.88	25.40%	1.46	22.34%	1.00	31.51%	2.59
M21/M22	2.20	1.64	25.45%	1.28	21.95%	1.00	21.88%	2.26


Ratio of drop between gears automatics
Transmission	1st	2nd	% Reduction	3rd	% Reduction	4th	% Reduction	Reverse
Powerglide (283 - 1964)	1.82	1.00	45.05%	n/a	n/a	n/a	n/a	1.82
Powerglide (327 - 1964)	1.76	1.00	43.18%	n/a	n/a	n/a	n/a	1.76
Powerglide (282/2 - 1965)	1.82	1.00	45.05%	n/a	n/a	n/a	n/a	1.82
Powerglide (283/4 & 327 - 1965)	1.76	1.00	43.18%	n/a	n/a	n/a	n/a	1.76
Powerglide (283 - 1966/1967)	1.82	1.00	45.05%	n/a	n/a	n/a	n/a	1.82
Powerglide (327/396 - 1966-1967)	1.76	1.00	43.18%	n/a	n/a	n/a	n/a	1.76
Powerglide (307 - 1968/1969/1970/1971/1972)	1.82	1.00	45.05%	n/a	n/a	n/a	n/a	1.82
Powerglide (327/396 - 1968)	1.76	1.00	43.18%	n/a	n/a	n/a	n/a	1.76
Powerglide (350/255hp & 300hp - 1969)	1.76	1.00	43.18%	n/a	n/a	n/a	n/a	1.76
Powerglide (350/250hp - 1969)	2.52	1.00	60.32%	n/a	n/a	n/a	n/a	1.93
Powerglide (350 - 1970)	1.76	1.00	43.18%	n/a	n/a	n/a	n/a	1.76

TH350	2.52	1.52	39.68%	1.00	34.31%	n/a	n/a	1.93

TH400	2.48	1.48	40.32%	1.00	32.43%	n/a	n/a	2.08

700R4	3.06	1.63	46.73%	1.00	38.65%	.75	25.00%	2.29

2004R	2.74	1.57	42.70%	1.00	36.31%	.67	33.00%	2.07

Popular Tremec Manual 5-speed transmissions	1st	2nd	% Reduction	3rd	% Reduction	4th	% Reduction	5th Gear O/D

Tremec TKX-5 - wide ratio - .0.72 O/D	3.27	1.98	39.45%	1.34	32.32%	1.00	25.37%	28%
Tremec TKX-5 - close ratio - 0.81 O/D	2.87	1.89	34.15%	1.28	32.28%	1.00	21.88%	19%
Tremec TKX-5 - close ratio - 0.68 O/D	2.87	1.89	34.15%	1.28	32.28%	1.00	21.88%	32%

4-SPEED TRANSMISSION I.D. CHART (opens new window and requires Adobe Reader)

Hurst Competition Plus Shifter

GM Automatic Transmission Dimensions

Transmission Type	Case to External Housing	Overall Length	Bellhousing to Mount
POWERGLIDE - SHORT	15 1/4"	24 1/4"	19 1/2"
POWERGLIDE - LONG	15 1/4"	27 1/2"	20 1/2"
TH-200 & TH-200C	27 5/8"	27 5/8"	20 1/8"
TH-250	21 5/8"	27 5/8"	20 3/8"
TH-350 SHORT	21 5/8"	27 5/8"	20 3/8"
TH-350 LONG	21 5/8"	30 5/8"	20 3/8"
TH-400 SHORT	24 3/8"	28 1/4"	26 3/4"
TH-400 LONG	24 3/8"	34"	28"
2004R	27 3/4"	27 3/4"	26 7/8"
700R4	23 3/8"	27 3/4"	22 3/8"
4L60	23 3/8"	27 3/4"	22 3/8"
4L60-E	23 3/8"	27 3/4"	22 3/8"
4L80-E	???	31 1/2"	30 3/8"

Courtesy: Richard Milkiewicz

GM Overdrive Transmissions

Dimensions	A	B	C	D	E
2004R	27-11/16"	27-11/16"	27"	3-3/4"	19-1/8"
700R4	30-3/4"	23-3/8"	22-1/2"	3-3/4"	20"

Transmission	Pressure Side
125/125C (3T40)	Bottom
180	Bottom
200/2004R	Top
325/325-4L	Bottom
350	Bottom
400/4L80e	Bottom
440-T4 (4T60)	Bottom
700R4 (4L60)	Bottom

Automatic Transmission Fluid Oxidation

Automatic transmission fluid will provide 100,000 miles of service before oxidation occurs under normal operating temperatures of about 170°F. Above normal operating temperatures, the oxidation rate doubles (useful life of fluid is cut in half) with each 20° increase in operating temperature.

Approximate life expectancy at various temperatures chart:

175°F	100,000 miles
195°F	50,000 miles
212°F	25,000 miles
235°F	12,000 miles
255°F	6,250 miles
275°F	3,000 miles
295°F	1,500 miles
315°F	750 miles
335°F	325 miles
355°F	160 miles
375°F	80 miles
390°F	40 miles
415°F	Less than 30 minutes

This chart clearly shows why transmission oil coolers and the various maintenance intervals are recommended for severe usage.

Above 300°F, the metals inside the transmission will warp and distort in varying degrees depending on the severity of overheat. Because this damage occurs and fluid life is so seriously impaired, rocking out of snow, mud or sand should never exceed a very few minutes.

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