Aircooled VW T1 (and T2 Split Screen) Gearbox Reference Table

All Data for Years, Ring and Pinions, Conversions and Final Drives for Aircooled T1 Transaxles, Swing Axle and IRS

 

Gearbox Codes
Code	Engine Size	Final Ratio	Model & Chassis Number
AA	1200	4.375	From Chassis No 0 981 810
AB	1300	4.375	Up to 8/70
AC	1500	4.125	also some 1300 from 8/70
AD	1200	4.375	Limited Slip Differential
AE	1300	4.375	Limited Slip Differential
AF	1500	4.125	L.S. Differential >8/70; also some 1300 8/70>
AG	1200	4.375	Type 147 Fridolin
AH	1500/1600	4.125	IRS from 8/68 – 8/72
AK	1500/1600	3.875	Type 181
AL	1500-1600	3.875	Type 181 with LSD
AM	1300	4.375	Saloon and Cabrio from 8/70
AN	1600	3.875	Karmann Ghia with IRS from 8/70
AO	1600	4.125	LSD 8/70 – 8/72
AR	1600	4.125	LSD 8/70 – 8/72
AR	1600	3.875	Karmann Ghia with LSD from 8/70
AS	1600(GT)	3.875	From 3/72
AT	1600	3.875	1303s and Cabrio from 3/72
AU	1600	3.875	1303s and Cabrio from 3/72 with LSD
BA	1300/1500	4.375	Semi Automatic from 8/68 – 8/70
BC	1300/1500	4.375	Semi Automatic from 8/68 – 8/70 with LSD
BE	1600	4.125	Semi Automatic from 8/68 – 8/70
BF	1600	4.125	Semi Automatic from 8/68 – 8/70 with LSD
BG	1300	4.125	Karmann Ghia Semi Automatic from 8/70
BH	1300	4.125	K. Ghia Semi Automatic with LSD
BJ	1300	4.375	Semi Automatic from 8/70
BK	1300	4.375	Semi Automatic from 8/70 with LSD
DA	1500/1600	4.125	Type 3 Swing-axle up to 8/68
DB	1500/1600	4.125	Type 3 Swing-axle up to 8/68 with LSD
DC	1500/1600	4.125	Type 3 IRS from 8/68
DD	1500/1600	4.125	Type 3 IRS from 8/68 with IRS

 

Final Drives and Ring and Pinion Info

Ring and Pinion (Crown and Pinion, Combinations and Origins, Also Known as Final Drive)

– 4.375 T1 (1200-1300cc Gearboxes)
– 4.125 T1 (1300-1500cc Gearboxes (Also Most Split Screen Reduction Box Units))
– 3.880 T1 (1600cc Gearboxes)
– 3.440 T1 (Never originally available, reproduction only)

Note: Reduction box combinations will reduce final drive by ratio, check your year and ratios to calculate.

– 4.571 T2 (082, 091 Boxes) Some 5 and 6 Rib Only
– 4.857 T2 (Oddball Year)
– 5.375 T2 (1600c T1 Engine Bay Windows)
 

4th Gear Available Combinations

Gears in certain cases can be crossed between boxes, note currently keyed shaft boxes have no available new R&P combinations since Brazil ceased production, all current final drive sets are splined (late) only.

– 0.91
– 0.889
– 0.821
– 0.770
 

All Data for Years, Ring and Pinions, Conversions and Final Drives for Aircooled T2 (002, 091) Transaxles

 

VIN	4th gear ratio	R&P ratio	R&P * 4th
218 000000 – 211 2 276560	0.821	5.375	4.413
211 2 276561 – 213 2 068547	0.821	5.375	4.413
213 2 068548 – 213 2 300001	0.889	5.375	4.778
214 2 000001 – 215 2 300001	0.889	4.857	4.318
216 2 000001 – 219 2 300001	0.889	4.571	4.064

Gearbox Ribs Explained (Applicable to T2 Bay Window Gearboxes only, does not work for T25 Vanagon). 

If you are unsure if you have a T2 Bay Window Gearbox, it is easy to tell by where the gear linkage comes out. On a Bay Window Gearbox it comes straight out the back (opposite end to the bellhousing). If it is a T25 box it will come out of the side on the nosecone.

Note:  The terms 002 and 091 gearboxes comes from the first 3 digits on the code found on the underside of the gearbox.