(Men)
1. 4.34+, Maurice Greene (USA) (during 9.82 100m, 2001 Edmonton WCH 100m final) (30m: 3.75e & 40m: 4.64e)

2= Tim Montgomery (USA) (during 9.78 100m, 2002 Paris Grand Prix final 100m)
2= 4.35+, Ato Boldon (TRI) (during 9.86 100m, 1998 Athens GP II 100m)

4= 4.37+, Ben Johnson (CAN) (during 9.79dq 100m, 1988 Seoul OG 100m final)
4= 4.37+, Ato Boldon (TRI) (during 9.86 100m, 1999 Athens GP II 100m)

4= 4.37+, Ato Boldon (TRI) (during 9.88 100m, 1998 Kuala Lumpar CG 100m final)
4= 4.37+, Ato Boldon (TRI) (during 9.88 100m, 2001 Oslo GL 100m)

4= 4.37+, Bruny Surin (CAN) (during 9.84 100m, 1999 Sevilla WCH 100m final)
4= 4.37+, Ben Johnson (CAN) (during 9.83 100m, 1987 Roma WCH 100m final)
4= 4.37+, Leroy Burrell (USA) (during 9.88 100m, 1991 Tokyo WCH 100m final)

http://atoboldon.com/letsrap/topic.asp?TOPIC_ID=2365&FORUM_ID=2&CAT_ID=3&Topic_Title=40+yard+dash&Forum_Title=*+Let's+Rap+*

http://www.lightning-fast.com/Lightning/LFwebsite.nsf/c2982efdc3db585e85256b9500014ca2/5676ce5453b553df85256b9b000f2aba?OpenDocument

Just for comparison, here's Montgomery's split times for his 9.78 record in Paris, 2002:


Tim Montgomery (USA)
Wind: +2.0m/s, RT: 0.104s (round-up to 0.11s)
10m: 1.85s (1.74s)
20m: 2.91s (1.06s)
30m: 3.82s (0.91s)
40m: 4.70s (0.88s)
50m: 5.54s (0.84s)
60m: 6.37s (0.83s)
70m: 7.21s (0.84s)
80m: 8.05s (0.84s
90m: 8.90s (0.85s)
100m: 9.78s (0.88s)
Fastest 10m Split:
0.83s, 50-60m.
50m Splits:
5.54s/4.24s = 9.78s (WR & NR)

http://64.233.161.104/search?q=cache:t3E1e1Mr_rIJ:www.discussfitness.com/showthread.php%3Ft%3D19623%26page%3D5+%2240+yard+dash%22+%22split+times%22&hl=en

Men
Reaction Time (RT) Limit: 0.100s

• 0-10m: 1.69s (Minus RT), Raymond Stewart (9.96s Tokyo WCH 1991, w+1.2m/s), Frankie Fredericks (9.86s Lausanne GP 1996, w-0.4m/s), Maurice Greene (9.79WR Athens GP 1999, w+0.1m/s & 9.82s Edmonton WCH 2001, w-0.2m/s) & Tim Montgomery (9.85s Edmonton WCH 2001, w-0.2m/s) (Note: 1.69s, also by Ben Johnson Seoul OG 1988 DQ*, 9.79s w+1.1m/s)
• 10-20m: 1.00s, Bruny Surin (9.84s Sevilla WCH 1999, w+0.2m/s) & Maurice Greene (9.82s Edmonton WCH 2001, w-0.2m/s) (Note: 1.00s, also by Ben Johnson Roma WCH sf. 1987 DQ*)