Differentials

The series letters were found at Matti's site.
Everything else came from various Toyota manuals and brochures.

The ring gear is also known as the crown wheel.
Ring gear sizes are measured by the outside diameter.

Ring & pinion ratios for 1970-1975 Celicas

Ring gear size	Gear Ratio	Ring teeth/Pinion teeth	Standard on
6.7" (T series)	3.7	37/10	RA20L RA21L
?	3.9	39/10	TA12-S TA20-K TA22-K
?	4.111	37/9	TA10 TA12L-KA TA20 TA22
?	4.300		TA12L-HA
?	4.375	35/8	TA10-Y

Ring and pinion ratios for 1975-1977 Celicas

Ring gear size	Gear Ratio	Ring teeth/Pinion teeth	Standard on	Optional on
6.7" (T series)	3.727	41/11	RA24L-KA RA24L-MA RA24L-MXA RA29L-MA RA29L-MXA
6.7" (T series)	3.909	43/11	TA14-K TA23-K TA28-K RA23-K RA28R-K RA24L-HA RA24L-HXA RA29L-HA RA29L-HXA
6.7" (T series)	4.100	41/10	TA14-H TA14-M TA23-H. TA23-M TA28-H TA28-M RA23-H. RA23-M RA28-H RA28-M	TA14-K TA23-K TA28-K
6.7" (T series)	4.100 LSD	41/10		TA23-MQG
6.7" (T series)	4.300	43/10		TA14-H TA23-H
7.5" (F series)	3.909	43/11	RA28-MQG
7.5" (F series)	3.909 LSD	43/11		RA28-MQG

Ring & pinion ratios for 1969-73 Coronas

Ring gear size	Gear Ratio	Ring teeth/Pinion teeth	Model
6.25" (C series)	3.7	?	RT81-K RT81L-K
6.38" (? series)	3.727	?	RT81-K RT81L-K
6.38" (? series)	4.100	?	RT81 RT81L RT81-C RT81L-C RT81-D RT81L-D RT81-DC RT81L-DC
6.62" (D series)	3.700	?	RT85-BK RT85-BN RT85L-KA RT95-BK RT95-BH RT95L-HA
6.62" (D series)	3.900	?	RT85L-NA RT85L-HA RT84-BK
6.62" (D series)	4.111	?	RT84-K RT84L-K RT84-DK RT84L-DK RT84-DN RT84L-DN
7.0" (? series)	3.900	?	RT89L-NA RT89L-KA
7.0" (? series)	4.375	?	RT87V Wagon 3 speed manual RT87LV Wagon 3 speed manual RT87V-K Wagon 4 speed manual RT87LV-K Wagon 4 speed manual
?	4.111	37/9	RT80-??? Sedan RT80L-??? Sedan RT83-??? Sedan RT83L-??? Sedan
? 4 pinion	4.111	37/9	RT94-??? Hardtop RT94L-??? Hardtop
?	4.375	35/8	RT86V-??? Wagon RT86VL-??? Wagon

Differentials from other cars.

Ring gear size	Gear Ratio	Ring teeth/Pinion teeth	Standard on
5.7" (B series)	4.222		Corolla KE2#
6.0" (U series)	4.111		Corolla 7#
6.0" (U series)	4.222		Corolla 7#
6.0" (U series)	4.444		Corolla 7#
6.25" (C series)	3.7	?	Corona RT81-K Corona RT81L-K
6.25" (C series)	3.909		Corolla TE2#L-KA
6.25" (C series)	4.100		Corolla USA TE2#L-HA(1973) Corolla USA TE27L-MAD
6.25" (C series)	4.111		Corolla USA TE27L-MAQ Corolla USA TE2#L-HA(1972)
6.38" (S or R series)			Corolla TE with collapsible type space Celica (Carina?) 1973
6.38" (? series)	3.727	?	Corona RT81-K Corona RT81L-K
6.38" (? series)	4.100	?	Corona RT81 Corona RT81L Corona RT81-C Corona RT81L-C Corona RT81-D Corona RT81L-D Corona RT81-DC Corona RT81L-DC
6.62" (D series)	3.700	?	Corona RT85-BK Corona RT85-BN Corona RT85L-KA Corona RT95-BK Corona RT95-BH Corona RT95L-HA
6.62" (D series)	3.900	?	Corona RT85L-NA Corona RT85L-HA Corona RT84-BK
6.62" (D series)	4.111	?	Corona RT84-K Corona RT84L-K Corona RT84-DK Corona RT84L-DK Corona RT84-DN Corona RT84L-DN
6.7" (T series)	?		Corona 14# Celica 6#
6.7" (T series)	LSD		Corona 14# Celica 6# Corolla AE86 (with rear disc)
6.7" (T series)	3.700	37/10 4 pinion	MkII RT62,72 Corona 80L-K,83L,85L,95L
6.7" (T series)	3.700	37/10	Celica USA 1971-72 Celica USA 1973 w/ man Corona USA 1970 w/ 8R-C Corona USA 1971-72 Corona USA 1973 sdn & HT w/ man MkII USA 1971-72 (4 cyl) sdn & HT w/ man
6.7" (T series)	3.727	41/11	Corona Sedan/Hardtop 12R Celica USA 1974-76 w/ 4 speed man Corona USA 1976 Celica USA 1977 w/ auto or 5 speed man
6.7" (T series)	3.900	39/10	Celica USA 1973 w/ auto Corona USA 1973 Sdn & HT w/ auto MkII USA 1971 Sdn & HT w/ auto MkII USA 1972 (4 cyl) sdn & HT w/ auto
6.7" (T series)	3.900	39/10 4 pinion	MkII RT60S
6.7" (T series)	3.909	43/11	Corona Sedan/Hardtop 16R,18R Celica USA 1974-76 w/ auto or 5 speed man Corona USA 1974 sdn & HT w/ man Corona USA 1975 sdn & HT w/auto
6.7" (T series)	4.100	41/10	Corona Sedan/Hardtop 12R,18R Carina TA45 Corona USA 1974 sdn & HT w/ auto Corolla USA 1975-77 1600 SR-5
6.7" (T series)	4.111	37/9	MkII RT60,70 Corona RT80-???,80L-???,83-???,83L-???
6.7" (T series)	4.300	43/10	Corolla USA 1975-77 1600 SR-5
7.0" (? series)	3.900	?	Corona RT89L-NA Corona RT89L-KA
7.0" (? series)	4.375	?	Corona RT87V Wagon 3 speed manual Corona RT87LV Wagon 3 speed manual Corona RT87V-K Wagon 4 speed manual Corona RT87LV-K Wagon 4 speed manual
7.1" (E series)	3.900	39/10	Corona Wagon 18R MkII RT78
7.1" (E series)	4.111	37/9	Corona Wagon 16R,18R
7.1" (E series)	4.111	37/9 4 pinion	Corona RT94-??? Hardtop RT94L-??? Hardtop
7.1" (E series)	4.300		Corona Wagon 12R
7.1" (E series)	4.375	35/8	MkII RT66,RT76 Corona RT86V Wagon
7.1" (E series)			Corona 14#
7.5" (F series)	4.100		Celica Supra MA47
7.5" (F series)			Celica 6#
7.5" (F series)	LSD		Celica 6#
?	3.700	37/10	MkII RX Sedan/Hardtop MkII RT63L-A Sedan manual trans MkII RT73L-A Hardtop manual trans Corona RT85L-A, RT95L-A
?	3.900	39/10	MkII MX Sedan/Hardtop MkII MX Wagon manual trans MkII RX Wagon MkII RT63L-HA Sedan auto trans MkII RT73L-HA Hardtop auto trans MkII RT79L-A Wagon Crown MS65L-A Sedan manual trans Crown MS75L-A Hardtop manual trans Crown MS63L-A Wagon manual trans
?	4.11		Hylux RN14L-A
?	4.111	37/9	MkII MX Wagon Auto Crown USA MS65L-HA Sedan auto trans Crown USA MS75L-HA Hardtop auto trans Crown USA MS63L-HA Wagon auto trans Corona RT80 Sedan Corona RT83 Sedan
? 4 pinion	4.111	37/9	Corona RT94 Hardtop
?	4.375	35/8	RT86V-??? Wagon RT86VL-??? Wagon

Differential carriers.

The carrier is the part bolted to the ring gear and carries the spider gears and all their parts.
It's size is slightly smaller than the ring gear size.

Size	Bolts	Series	Models
6.62"	10 bolt	T	72-73 carina 73 corolla 1600 SR-5 71-73 celica 71 MkII sdn & HT 72 MkII ( 4cyl) Sdn & HT 71-73 corona (except wagon) 74-78 corona sdn & HT 74-77 celica 78-79 celica LB 80 celica LB automatic (3.73) 80 celica LB manual (3.58) 80 celica CP GT 79-80 corona wagon 74-79 corolla 1600 SR-5
6.7"	10 bolt	?

Axles widths from other cars

Model	Front Track	Rear Track	Rear Face	Wheel offset	Rim size	Tyre size
TA22		1320			13"	13
TA22 GT				-32	13"	13
RA28 Celica	1350	1310	1365	-29	14"	R14
MA47 Supra			1417		14"	R14
1984 GT-S Celica				-8	14"x7	225/60HR14
1984 MA61 Supra GT-S				-20	15"x6	15
1980 TA45 Carina		1370		-32	13"	13
Corona			1420		14"	14
XT130 Corona		1360			14"	14
1979 Corona			* 1410		14"	14
Crown Super Saloon			* 1460		14"	14
Cressida			1420		14"	14
MX32 Cressida		1400			14"	14
1982 MA62 Cressida		1400			14"	14
1982 TE70 Corolla SR coupe	1335	1350			13"	155SR13 175/70SR13
1982 TE72 Corolla GT hardtop	1340	1345			13"	185/70HR13
1982 TE72 Corolla GT liftback	1340	1345			13"	185/70HR13
1980 TE72 T-18 SE liftback	1325	1335		-32	13"	165SR13

Track=Millimetres between tyre centre lines.
Face=Millimetres between wheel mounting surfaces.
Offset is the distance betwwen the wheel centre line and the mounting surface
Measurements marked with * are not very accurate.

Diff ratios and teeth counts

Ratio	Ring Teeth	Pinion Teeth
3.700	37	10
3.727	41	11
3.900	39	10
3.909	43	11
4.100	41	10
4.111	37	9
4.300	43	10
4.375	35	8
4.556	41	9
5.286	37	7
5.714	40	7

Diff ratios and teeth counts

T series diffs have 24mm axles before 1986 and 25mm axles after 1986 (I am not sure if the splines are compatible).
E series diffs have 25mm axles.
Some RA40 GT factory rally cars are rumoured to have E series diffs with 28mm axles (most RA40 GT's had T or F series diffs).

Last updated 1^st June 2003